Answers
Answer:
This is an isosceles right triangle, so
x = 45°.
Related Questions
An item is regularly priced at $43. Bill bought it on sale for 35% off the regular price. Hownmuch did he pay?
Answers
Given the regular price is $43.
S.P= 35% off on regular price i.e.
[tex]\begin{gathered} S\mathrm{}P=\text{ }\frac{65}{100}\times43 \\ S\mathrm{}P=27.95 \end{gathered}[/tex]Hence, after 35% off, the price is $27.95
how many time can 7 go into 65
Answers
Answer:
9
Step-by-step explanation:
The answer you divide 65 by 7 which would get you 9.2857142857143. The remainder is 2.
MATHEMATICALLY WE WRITE THE PROBLEM AS
[tex] = \frac{65}{7} \\ [/tex]
SOLVING FURTHER
[tex]65 \div 7 \\ = 9.285714286[/tex]
BUT 7 GOES 9 TIMES IN 65 NOT CONSIDERING THE REMINDER.
HOPE THIS HELPS
9 Ron's family plans to add a new room to their house. They initially planned the width and the length of the room to be 10 feet and 25 feet. Now they want to add to the width. The amount they want to add to the width is shown by the variable I. 25 101 + Ron thinks that the area of the room will be 250 + 257. Is he correct? Why or why not? Select all that apply. A Yes, because the area of the room is the sum of 25.10 and 25r. No, because the area of the room is the sum of 25 . 10 and I. No, because the area of the room is the product of 25 + 10 and 25.1. D Yes, because the area of the room is the product of 25 and 10+ I.
Answers
The room is a rectangle with dimensions 25 and x + 10. The area of a rectangle is the product of its dimensions, so the area will be:
[tex]25\cdot(x+10)[/tex]We have to add the parenthesis because we first need to add 10 and x and then multiply. Distributing the 25, we have:
[tex]25\cdot(x+10)=25\cdot x+25\cdot10=25x+250=250+25x[/tex]As we can see, this matches what Ron thinks the area will be, so he is correct. Thus, the answer is "Yes". The why can be both because the area is the sum of 25*10 and 25x and because the area is the product of 25 and 10 + x.
So, the correct alternatives are A and D.
One way to determine whether a number is prime or composite is by creating a factor table.
Complete the factor table and the sentences below about the number 18.
Answers
The conclusion from the factor table of 18 is that, 18 is not a prime number i.e. it is composite
How to determine the factor table?From the question, the number is given as
Number = 18
The factors of 18 are represented as
Factors of 18 = 1, 2, 3, 6, 9 and 18
When these factors are picked in pairs, we have the following representations
Factors pairs of 18 = (1, 18), (2, 9), (3, 6)
Next, we represent the factors on a factor table
So, we have
Factors Factor pairs Prime factorization
1, 2, 3, (1, 18) 2 x 3²
6, 9 and (2, 9)
18 (3, 6)
Because the number 18 has factors other than 1 and 18, then the number 18 is a composite number
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it says determine how to rewrite one of the two equations above in the form ax + by=c. where a B and C are consistent so that the sum of the new equation in the unchanged equation from the original system results in an equation of one variable
Answers
Solution
-3x +4y = 24 (1)
6x +2y =-18 (2)
We can multiply equation (1) by 2 and we got:
-6x + 12y = 48
6x +2y =-18
_____________
14 y= 30
y = 30/14= 15/7
And the value of x would be:
x= 4y-24/3
x= (60/7 -24)/3
20 PTS GET MAKED BRAINLIEST IF CORRECT
Answers
a) the probability that event A occurs but event B does not occur = 0.33
b) the probability that either B occurs without A occurring or A and B both occur = 0.04
In this question, we have been given two mutually exclusive events A and B.
event A has probability 0.33 and the event B has probability 0.04
P(A) = 0.33 and P(B) = 0.04
We need to compute the probability that event A occurs but event B does not occur.
i.t., to find = P(A ∩ B')
We know that, P(A ∩ B') = P(A) - P(A ∩ B)
For mutually exclusive events, P(A ∩ B) = 0
So, P(A ∩ B') = P(A)
P(A ∩ B') = 0.33
Also, we need to compute the probability that either B occurs without A occurring or A and B both occur.
P(B ∪ A') + P(A ∩ B)
= P(B) + 0
= 0.04
Therefore, a) the probability that event A occurs but event B does not occur = 0.33
b) the probability that either B occurs without A occurring or A and B both occur = 0.04
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the table below shows the percentage of votes each sport received in a recent survey of student's favorite sports. will send image
Answers
Basketball 12 votes; Soccer 24 votes; Football 24 votes
Here, we want to select the options that could represent the percentage
From what we have, soccer and football are same value and basketball is half of these
So the option where we have the given outline is the correct answer
Looking at the options, the only place we have the outline is;
Basketball 12 votes; Soccer 24 votes; Football 24 votes
I can’t figure out how to solve this
Step by step process needed! Thank you!
Simplify Radicals
Answers
After simplification the answer is 31.418 or 31.42
Define Radicals
The √ symbol that is used to denote square root or nth roots. Radical Expression - A radical expression is an expression containing a square root.
The given expression is,
2√6(√2 + 5)
First, open the brackets
2√6 * √2 + 5 * 2√6
we know, √6 = √3 * 2 = √3 * √2
so, 2√3 * √2 * √2 + 10√6
We didn't open the both √6 values it's because we want to remove root from √2 so as we know √2 * √2 = 2
2√3 * 2 + 10 * √6
=> 4√3 + 10 * √6
Now, put the values of √3 = 1.732 and √6 = 2.449
=> 4 * 1.732 + 10 * 2.449
=> 6.928 + 24.49
=> 31.418 or 31.42
Therefore, the answer is 31.418 or 31.42
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does the ordered pair (-1, -9) satisfy the equation y=7-2x
Answers
Answer:
No
Step-by-step explanation:
In order to solve this, we plug in the values for x and y. Remember that x = -1 and y = -9
-9 = 7 - 2(-1)
-9 = 7 + 2
-9 ≠ 9
Luna purchased a computer at the list price of ₱56,000, less 30% and 20%. How much must Luna pay for the computer?
Answers
There are two disccount applied to this computer, the first one is 30%. To calculate its value, we need to multiply the original price by the fraction that represents 30%
[tex]\text{discount}1=56000\cdot\frac{30}{100}=16800[/tex]The first discount was 16,800. To determine the price after this, we need to subtract the listed price by the discount 1, this is done below:
[tex]\text{price}2=56000-16800=39200[/tex]Then we need to calculate the second discount, which was equal to 20%.
[tex]\begin{gathered} \text{discount}2=39200\cdot\frac{20}{100}=7840 \\ \end{gathered}[/tex]The final price is the subtraction between the price 2 and the discount 2, we have:
[tex]\text{ final price}=39200-7840=31360[/tex]The final price is 31,360.
f(x) = integrate t ^ 4 dt from 3 to x
Answers
We have the function f(t) defined as:
[tex]f(x)=\int_3^xt^4dt[/tex]We have to find f'(x).
We can solve this integral as:
[tex]f(x)=\frac{t^5}{5}|^x_3=\frac{x^5}{5}-\frac{3^5}{5}[/tex]If we derive this expression for f(x) we obtain:
[tex]f^{\prime}(x)=\frac{d}{dx}(\frac{x^5}{5}-\frac{3^5}{5})=\frac{5}{5}x^4+0=x^4[/tex]NOTE: This expression could have been derived from the function inside the integral.
We can now find f'(3) as:
[tex]f^{\prime}(3)=3^4=81[/tex]Answer:
f'(x) = x^4
f'(3) = 81
A 2-column table with 4 rows. The first column has entries glass, baby oil, maple syrup, wax. The second column has entries 2.40 grams per centimeter cubed, 0.83 grams per centimeter cubed, 1.37 grams per centimeter cubed, 0.93 grams per centimeter cubed.
Use the information in the table to predict whether each substance will sink or float in water. Note that the density of water is 1.0 g/cm3.
Glass:
Baby oil:
Maple syrup:
Wax:
Answers
The Glass and Maple syrup will sink , Baby Oil and Wax will float in water.
We are provided with the following data mentioned below:
Glass Baby oil Maple syrup Wax
2.40 0.83 1.37 0.93
The density of water = 1.0 [tex]g/cm^{3}[/tex]
The material with the lower density floats and the material having higher velocity sinks. As the density of glass is 2.40 [tex]g/cm^{3}[/tex] which is larger than the density of water , so glass will sink in water. As the density of baby oil is 0.83 [tex]g/cm^{3}[/tex] which is less than the density of water , so glass will float in water.
As the density of Maple syrup is 1.37 [tex]g/cm^{3}[/tex] which is larger than the density of water , so Maple syrup will sink in water. As the density of Wax is 0.93[tex]g/cm^{3}[/tex] which is less than the density of water ,so Wax will float in water.
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Answer:
Step-by-step explanation:
hi. I was hoping you can solve this for me. I would be so grateful.
Answers
We have
1. The timing shown in the morning is from 8:15 to 12:15, this is the number of hours worked in the morning is 4 hours.
The pay is $13.50 per hour
Therefore, the pay earned in the morning is:
[tex]\begin{gathered} pay=N\text{. hours }\times pay\text{ per hour } \\ \text{pay = 4}\times13.50 \\ \text{pay}=54 \end{gathered}[/tex]then, the pay earned in the morning is $54
2. The timing shown in the afternoon is from 13:00 to 17:30, this is the number of hours worked in the afternoon is 4 hours and 30 minutes. Therefore, the pay in the afternoon is:
[tex]pay\text{ =4.5}\times13.50=60.75[/tex]then, the pay earned in the afternoon is $60.75
The pay per 1 day is:
pay in the morning + pay in the afternoon
[tex]total\text{ pay = 54+60.75=114.75}[/tex]Answer: pay for a day is $114.75
Graph the following function.
f(x)=2(x-2)²-4
Answers
The graph of the given expression f(x)=2(x-2)²-4 is shown (refer to the graph attached below.)
What is a graph?In mathematics, a graph is a visual representation or diagram that shows data or values in an ordered way. The relationships between two or more things are frequently represented by the points on a graph. Charts and graphs come in a variety of styles.Line graphs, bar graphs and histograms, pie charts, and Cartesian graphs are likely the four most popular types. A graph's function representation can be determined using the vertical line test. All points with a certain x value are included in a vertical line. Output for a given input x value is represented by the y value of the point on a graph where a vertical line intersects it.So, f(x)=2(x-2)²-4:
Now, graph the function f(x)=2(x-2)²-4 as follows.(Refer to the graph attached below)Therefore, the graph of the given expression f(x)=2(x-2)²-4 is shown (refer to the graph attached below.)
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WILL MARK BRAINLIEST
Answers
Step by step
-18x -9y = 7
Now to find y intercept and slope
-18x -9y = 7
Put this in y intercept form
y = mx + b
-9y = 18x +7
Divide both sides by -9 to isolate y
-9/-9 y = 18/-9 x + 7/-9
y = -2x -7/9 is your equation in slope intercept form
-2 is your slope (m)
-7/9 is your y intercept (b)
Problem solved!
Shiloh has 47 books. She wants to put them all on bookshelves. How many bookshelves will Shiloh need if each shelf holds 5 books?
A.
47
÷
5
=
7
R
2
Shiloh will need 8 shelves.
B.
47
÷
9
=
5
R
2
Shiloh will need 9 shelves.
C.
47
÷
5
=
7
R
2
Shiloh will need 7 shelves.
D.
47
÷
5
=
9
R
2
Shiloh will need 10 shelves.
Answers
The number of bookshelves needed if each bookshelves contain 5 books is 10.
How to find the number of shelves will hold the books?She has 47 books. . She wants to put them all on bookshelves.
Therefore, the number of bookshelves she will need if each shelf holds 5 books can be calculated as follows:
The total number of books she has in her possession is 47 books.
All the books must have a place in the bookshelves.
Each bookshelves can only contain 5 books.
Hence,
let
x = number of bookshelves
Therefore, the equation to find the number of bookshelves is as follows:
5x = 47
divide both sides by 5
x = 47 / 5
x = 9.4
Therefore, Shiloh will require 10 book shelves.
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Write the equation of the line that passes through the points(3,0) and(8,3)Put your answer in fully simplified point-slope form, unless it is a vertical or horizontal line.
Answers
Answer:
5/3
Step-by-step explanation:
rise over run
(8-3)/(3-0)
Find the common factors and the highest common factor of each of the following
a. 6, 8 and 10
b. 4, 8 and 12
c. 10, 15 and 20
d. 6, 12 and 24
e. 8, 12 and 16
f. 13, 26 and 39
h. 16, 32 and 40
g. 12, 14 and 16
i. 16, 56 and 64
j. 8,24 and 40
k. 7, 35 and 42
l. 22,44 and 66
Answers
a:2
b:4
c:5
d:6
e:4
f:13
h:8
g:2
i:8
j:8
k:7
l:22
need answers asap
I'm also giving brainliest to the right answer
Answers
Answer:
y = 3x + 3 :D
Step-by-step explanation:
Equation of line: y = mx + b :)
b: Y intercept
m: Slope
Now lets solve :)
Lets find M first :)
We need 2 points so lets use (0,3) and (1,6) :)
We fist need to subtract :)
6 - 3 = 3
1 - 0 = 1
Now we divide :)
3/1 = 3
Lets put that into our equation :)
y = 3x + b
Now lets find B :)
To find b, we need to see where the line intercepts the y axis! This will be at point (0,3)!
The y intercept will be 3 :)
The final equation will be y = 3x + 3 :)
Have an amazing day!!
Please rate and mark brainliest if helpful!
Graph a line with a slope of2that contains the point (-3,5).5
Answers
We will investigate how to graph a straight line on cartesian coordinate plane.
All equations of straight line are expressed in a general slope-intercept form as follows:
[tex]y\text{ = m}\cdot x\text{ + c}[/tex]Where,
[tex]\begin{gathered} m\colon\text{ slope} \\ c\colon\text{ y-intercept} \end{gathered}[/tex]To graph any straight line we need the equation of the straight line or atleast two points that must lie on the line.
We are given the slope ( m ) and one of the points that lie on the line as follows:
[tex]\begin{gathered} m\text{ = -}\frac{2}{5} \\ \\ (\text{ -3 , 5 )} \end{gathered}[/tex]We need one another point that lies on the line to plot the graph of a straight line. To find another point we must completely express the equation of the straight line ( general form given above ).
We see that an equation of a straight line is defined by two parameters i.e ( m and c ). We are given the value of the slope ( m ). We will go ahead and plug it into the general slope-intercept form given above:
[tex]y\text{ = -}\frac{2}{5}\cdot x\text{ + c}[/tex]Now to determine the value of parameter ( c ) we must have atleast one point that lies on the line. We will use the point given to us and plug in the respective coordinates in the equation developed above and solve for ( c ) as follows:
[tex]\begin{gathered} (\text{ x , y ) }\to\text{ ( -3 , 5 )} \\ \\ 5\text{ = -}\frac{2}{5}\cdot(-3)\text{ + c} \\ \\ 5\text{ = }\frac{5c\text{ + 6}}{5} \\ \\ 25\text{ = 6 + 5c} \\ \\ c\text{ = }\frac{19}{5} \end{gathered}[/tex]We will go ahead and update the equation of the straight line as follows:
[tex]y\text{ = -}\frac{2}{5}\cdot x+\frac{19}{5}[/tex]Now to get one more point to graph the plot we will assume any value of the for either variable ( x or y ) and then determine the value of the other variable as follows:
[tex]\begin{gathered} x\text{ = 2} \\ \\ y\text{ = -}\frac{2}{5}\cdot(2)\text{ +}\frac{19}{5} \\ \\ y\text{ = }\frac{-4+19}{5} \\ \\ y\text{ = }\frac{-15}{5} \\ \\ y\text{ = -3} \end{gathered}[/tex]Therefore, we have the two points to plot the graph as follows:
[tex](\text{ -3 , 5 ) \& ( 2 , -3 )}[/tex]We can go ahead and select the above points on the given grid to construct the straight line!
If you roll a die, find the probability that you: (Enter your answers in exact form or round to 3 decimalplaces.)(a) roll at least 4 or an odd number,Answer:(b) roll an even number or a number at most 5.Answer:
Answers
A.
The question asks us to find the probability of getting at least 4 or an odd number after throwing a die.
This is easily gotten using the OR probability of two events which states:
[tex]\begin{gathered} P(A\text{ OR B) = P(A) + P(B) - P(A AND B)} \\ \text{if A = rolling at least 4} \\ B\text{ = rolling odd number,} \\ \\ P(\text{rolling at least 4 OR rolling odd number) = } \\ P(\text{at least 4) + P(odd number) - P(at least 4 AND odd number)} \end{gathered}[/tex]To get at least 4, it means the possible values we can have are: 4, 5, 6.
To get an odd number, it means the possible values we can have are: 1, 3, 5.
From both set of possibilities, 5 is common. We need to subtract the probability of getting a 5 in both situations to prevent duplication.
Thus, we can compute each probability:
[tex]\begin{gathered} P(any\text{ number)= }\frac{1}{6} \\ \\ P(at\text{ least 4)= P(4) OR P(5) OR P(6) = P(4) + P(5) +P(6)} \\ \therefore P(at\text{ least 4)= }\frac{1}{6}+\frac{1}{6}+\frac{1}{6}=\frac{3}{6} \\ \\ P(\text{odd number) = P(1) OR P(3) OR P(5) = P(1)+P(3)+P(5)} \\ \therefore P(\text{odd number)= }\frac{1}{6}+\frac{1}{6}+\frac{1}{6}=\frac{3}{6} \\ \\ P(\text{at least 4 AND odd number) = }\frac{1}{6} \\ \\ \\ \therefore P(\text{at least 4 or odd number)=}\frac{3}{6}+\frac{3}{6}-\frac{1}{6}=\frac{5}{6} \end{gathered}[/tex]Therefore, the probability of getting at least 4 or an odd number is 5/6
B:
This part of the question asks us to find the probability of rolling an even number or a number at most 5.
We, once again, take a look at the possibilities to solve this question.
Possibilities of getting an even number are: 2, 4, or 6
Possibilities of getting at most 5 are: 1, 2 , 3, 4, 5.
Therefore, we can compute the probabilities as:
[tex]undefined[/tex]Use the number line to find the coordinate of the midpoint of
¯¯¯¯¯¯
L
P
.
Answers
The mid-point of LP is 1.5.
Here we have to find the mid-point of the line LP
L is on -2 on the line and P is on 5.
To find the mid-point we have a formula:
mid-point = (b - a)/2
where a and b are two points between which we have to find the mid-point.
So, mid-point of LP = 5 - (-2) / 2
= 7/ 2
= 3.5
Now we have to find the value so we will subtract -2 with 3.5.
So the mid-point is 3.5 - 2= 1.5.
Therefore the mid-point of the line LP is 1.5.
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What is 1/3 divided by 2/3
Answers
Answer:
1/2
Step-by-step explanation:
Do divide fractions, multiply the first number by the reciprocal (the numbers flipped) of the second number.
So, 1/3 * 3/2
1/3 * 3/2 = 3/6
3/6 = 1/2
Solve: - 4x + 1 ≤ 21 and 5x + 2 < 22A. x ≥ -5 and x < 4B. x > -5 and x ≤ 4C. x ≥ -5 or x < 4D. x > -5 or x ≤ 4
Answers
ANSWER
A. x ≥ -5 and x < 4
EXPLANATION
We have the two inequalities:
- 4x + 1 ≤ 21 and 5x + 2 < 22
Let us solve them separately:
FIRST ONE
-4x + 1 ≤ 21
Collect like terms:
-4x ≤ 21 - 1
-4x ≤ 20
Divide through by -4, the sign changes:
[tex]\begin{gathered} x\ge\text{ }\frac{20}{-4} \\ x\text{ }\ge\text{ -5} \end{gathered}[/tex]SECOND ONE
5x + 2 < 22
Collect like terms:
5x < 22 - 2
5x < 20
Divide through by 5:
x < 20 / 5
x < 4
The answer is Option A.
Felix is making a pattern with tiles shaped like parallelograms. He needs 5 black tiles
and 5 white tiles. The tiles cost $0.50 per cm².
What is the total area of the tiles Felix needs
to buy?
Answers
Answer: 80
Step-by-step explanation:
You do 2 times= 8 and multiply 8 to the 5 white and black tiles which equals 40+40=80.
The total area for the parallelogram shaped tiles Felix needs to buy is 80cm² at the price of $40.
Area of parallelogramIn calculating for the area of parallelogram, the base is multiplied by the height, as the same way for calculating the area of a rectangle.
Given that, the base of one parallelogram shaped tile is 4cm with height as 2cm.
Area of one parallelogram shaped tile = 4cm × 2cm
Area of one parallelogram shaped tile = 8cm²
Total area for the 5black and 5white tiles = 10 × 8cm²
Total area for the 5black and 5white tiles = 80cm²
Therefore, Felix needs to buy a total of 80cm² of 10 parallelogram shaped tiles.
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A truck driver averages 60 miles per hour while delivering freight and 45 mph on the return trip.The total driving time is 10 hours. How much longer does the return trip take than the delivery
Answers
The return trip takes 0.7 hrs more than the delivery.
Let the time taken while going be x therefore the time taken while returning will be 10 - x.
Given :
The truck driver averages 60 miles per hour while delivering freight
The speed is 45 mph on the return trip.
Therefore according to the question,
60x = 45 ( 10 - x) [ As the distance is same]
=> 4x = 3 ( 10 - x)
=> 4x = 30 - 3x
=> 7x = 30
=> x = 30 / 7
=> x = 4.3
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help meeeeeee pleaseee !!!!
Answers
The equation of the line that passes through the points ( -3,18 ) and ( 2,-7 ) is f(x) = -5x + 3.
What is the equation of line passing through the given points?The formula for equation of line is expressed as;
y = mx + b
Where m is slope and b is y-intercept.
Given the data in the question;
Point 1( -3,18 )
x₁ = -3y₁ = 18Point 2( 2, -7 )
x₂ = 2y₂ = -7First, we find the slope of the line.
m = ( y₂ - y₁ ) / ( x₂ - x₁ )
m = ( -7 - 18 ) / ( 2 - (-3) )
m = ( -25 ) / ( 2 + 3 )
m = ( -25 ) / ( 5 )
m = -5
Next, next we find the y-intercept
y = mx + b
18 = (-5)(-3) + b
18 = 15 + b
b = 18 - 15
b = 3
Now that the values of slope m and y-intercept b is known, plug these into y = mx + b to determine the equation of the line.
y = mx + b
y = (-5)x + 3
y = -5x + 3
Therefore, the equation of the line is y = -5x + 3
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Write an algebraic expression as indicated. The algebraic expression for the mountain Roberto‘s other account is
Answers
We have here that Roberto has a total of $3300 in two savings account.
Then, if y represents the amount in one account, we have that the sum of both accounts is up to $3300.
We can suppose that the other account is x. Then, we have:
[tex]x+y=\$3300[/tex]If we subtract y from both sides of the equation, we have:
[tex]x+y-y=\$3300-y\Rightarrow x=\$3300-y[/tex]Therefore, the algebraic expression for the amount in Roberto's other account is (since x is not mentioned, we have):
[tex]\$3300-y[/tex]In summary, the amount in Roberto's other account is $3300 - y.
please helpppppp
For the three-part question that follows, provide your answer to each part in the given workspace. Identify each part with a coordinating response. Be sure to clearly label each part of your response as Part A, Part B, and Part C.
Greg bought a regular-sized box of his favorite cereal. A regular-sized box contains 12 servings.
Part A: If Greg eats 1 1/2 servings for breakfast every day, how many breakfasts can Greg eat from 1 box? Show all work.
Part B: The regular-sized box of cereal costs $4.29. How much does 1 breakfast from a regular-sized box of cereal cost Greg? Round to the nearest hundredth. Show all work.
Part C: If Greg purchased the family-sized box of cereal that contains 18 servings, how many more breakfasts could Greg eat from 1 box? Show all work.
Answers
a. Greg can eat 8 breakfasts from 1 box.
b. The cost of 1 breakfast from a regular-sized box is $34.32.
c. Greg will enjoy 4 breakfast more.
How to calculate the fraction?a. A regular-sized box contains 12 servings. If Greg eats 1 1/2 servings for breakfast every day, the number of breakfasts that Greg can eat from 1 box will be:
= 12 ÷ 1 1/2
= 12 ÷ 1.5
= 8
b. Since the regular-sized box of cereal costs $4.29. The cost of 1 breakfast from a regular-sized box of cereal cost Greg will be:
= 8 × $4.29
= $34.32
c. If Greg purchased the family-sized box of cereal that contains 18 servings, the number of breakfasts will be:
= 18 ÷ 1.5
= 12 breakfast
The difference will be:
= 12 - 8
= 4 breakfast more.
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Find the value of x. A. 9B. 145C. 8D. 154
Answers
Answer: C. 8
When we have two chords intersecting inside a circle, the products of the lengths of the segments are equal to one another. This means that for the given circle, we have the following:
10 * 4 = 5 * x
We can solve for x by multiplying 10 by 4, which is 40, and then dividing by 5, to isolate x, which is 8.