The value of the expression 7x² + 2(3x - 8) - 5x for x = 3 will be 50.
What is substitution method?
Find the value of any one of the variables from one equation in terms of the other variable is called the substitution method.
Given that;
The expression is,
7x² + 2(3x - 8) - 5x
Now, The value of the expression 7x² + 2(3x - 8) - 5x for x = 3 calculated as;
The expression is,
7x² + 2(3x - 8) - 5x
Now, For the value of expression 7x² + 2(3x - 8) - 5x for x = 3 , we can substitute x = 3;
7x² + 2(3x - 8) - 5x
7 (3)² + 2 (3 × 3 - 8) - 5 × 3
7 × 9 + 2 (9 - 8) - 15
7 × 9 + 2 × 1 - 15
63 + 2 - 15
65 - 15
50
So, For x = 3,
⇒ 7x² + 2(3x - 8) - 5x = 50
Thus, The value of the expression 7x² + 2(3x - 8) - 5x for x = 3 will be 50.
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There are 36 students in s2a some of them usually bring their own lunch and the other buy lunch.if 1/5 of the students who usually bring their own lunch buy their lunch today , the ratio of the number of students bringing their own lunch to number of students buying lunch becomes 1:2. how many students are there who usually bring thier own lunch ?
The no. of students who usually bring their own lunch is 15.
What is the ratio?The ratio is a comparison between two or more quantities in simplest form.
Given there are 36 students in an s2a class some of them bring their own lunch and the others buy their lunch.
Assuming x students bring their own lunch hence (36 - x) students buy their lunch.
(1/5)th of the student who brings their own lunch is (1/5)×x = (x/5).
∴ x - (x/5) : (36 - x) + (x/5) = 1 : 2. (The reduced students are added to the
other category).
4x/5 : 36 - 4x/5 = 1 : 2.
4x/5 : (180 - 4x)/5 = 1 : 2.
(4x/5)÷(180 - 4x)/5 = 1/2.
(4x/5)×5/(180 - 4x) = 1/2.
4x/(180 - 4x) = 1/2.
4x = (180 - 4x)/2.
8x = 180 - 4x.
12x = 180.
x = 15.
∴ 15 students usually bring their own lunch.
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In a sample of 30000 first borne babies, 6 were found to have Down syndrome. Find the empirical probability thay a famili’s first child will be born with this sydrome
The probability that a family’s first child will be born with down syndrome is 1/5000
Number of first borne babies = 30000
Number of first borne babies having Down syndrome = 6
Probability is defined as the ratio of number of favorable outcomes to the total outcome.
Probability = (number of favorable outcomes)/(total outcome)
We have to find the probability that a family’s first child will be born with down syndrome. So, Number of first borne babies having Down syndrome is equal to the total number of favorable outcomes and Number of first borne babies will also be equal to total outcome. Hence we can write,
Probability = (number of favorable outcomes)/(total outcome)
Probability = 6/30000
Probability = 1/5000
So, the required probability is 1/5000.
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the sum of two consecutive natural number is 36 find the number
Solve the following linear equation using equivalent equations to isolate the variable. Express your answer as an integer, as a simplified fraction, or as a decimal number rounded to two places.
ANSWER
[tex]u=\frac{1}{5}[/tex]EXPLANATION
We want to solve the given linear equation:
[tex]-6u=\frac{-6}{5}[/tex]To do this, divide both sides of the equation by -6 to isolate u and simplify:
[tex]\begin{gathered} \frac{-6u}{-6}=\frac{-6}{5}\cdot\frac{1}{-6} \\ \Rightarrow u=\frac{1}{5} \end{gathered}[/tex]That is the solution to the linear equation.
helllpppppppppppppp.
Answer:
See below
Step-by-step explanation:
An anonymous survey of college students was taken to determine behaviors regarding alcohol, cigarettes, and illegal drugs. The results were as follows: 855 drankalcohol regularly, 657 smoked cigarettes, 192 used illegal drugs, 418 drank alcohol regularly and smoked cigarettes, 109 drank alcohol regularly and used illegal drugs,116 smoked cigarettes and used illegal drugs, 88 engaged in all three behaviors, and 251 engaged in none of these behaviors.Answer parts a, b, c, d, e, f, g for this question.
To solve the question, we will be using a Venn Diagram. Let's list down what's given first:
855 drank alcohol
657 smoked cigarettes
192 used illegal drugs
418 both drank alcohol and smoked cigarettes
109 drank alcohol and used illegal drugs
116 smoked cigarettes and used illegal drugs
88 engaged in all three
and 251 engaged in none of these
We will draw a Venn Diagram with 3 circles, one for each vice. Then we will start with the intersection of all three and the area outside of the circles (for those who do not engage in vices).
Because we know how many engaged in all 3 vices, we can deduct that number from those who belong to the intersection of 2 vices since they have already been counted in that too.
418 - 88 = 330 drank and smoked, but not used drugs
109 - 88 = 21 drank and used drugs, but not smoked
116 - 88 = 28 smoked and used drugs but not drank
Then, we subtract the numbers in each circle from the total for each vice.
855 - (330 + 88 + 21) = 416 drank only
657 - (330 + 88 + 28) = 211 smoked only
192 - (88 + 21 + 28) = 55 used drugs only
To find the total number of surveyed students, we just need to add all the numbers in the Venn Diagram.
416 + 330 + 88 + 21 + 211 + 28 + 55 + 251 = 1,400
Therefore, there were 1,400 students who were surveyed.
May I please get help with this for I am confused and have tried many times to re-create the reflection of the triangle
We have to reflect the triangle across the y-axis.
If we have a point P = (x,y) and we reflect it across the y-axis, we will change the x-coordinate to its opposite value and and the y-coordinate is kept the same.
The image point then is P' = (-x,y).
Then, to reflect the triangle, we have to reflect the three vertices and then join the vertices.
We can then reflect the vertices as:
PLEASE HURRY
What is the value of the expression 45x − 16 if x is equal to −6?
Answer:
-286
Step-by-step explanation:
45(-6)-16
= -270 - 16
= -286
Step-by-step explanation:
45x - 16
x = -6
45(-6) - 16
-270 - 16
-286
Hope this helps! :)
Use the slope formula to find the slope of the line through the points (−8,−6) and (0,−7).
Answer:
Slope formula is given as (y2-y1) ÷ (x2-x1) or (y1-y2) ÷ (x1-x2), where x and y are the coordinates of the points.
Slope = (-7-(-6)) ÷ (0-(-8))
= (-7+6) ÷ (0+8)
= -1/8
Name the segments in the figure below.Q R S ISelect all that apply.
Answer
Options A, F, G, N
The line segments include
QR
QS
QT
RS
RT
ST
Note that the segments only have a dash on top of them and not an arrow.
Explanation
A line segment is a region of a line bounded by two different endpoints and contains all the points on the line that are between the two endpoints.
From the attached image, we can see that there is a line with infinite length (the arrows at the two endpoints indicate that this line continues till infinity), has points Q, R, S and T.
So, the line segments will be any space from one endpoint to another. They'll include
QR
QS
QT
RS
RT
ST
Note that the segments only have a dash on top of them and not an arrow.
Hope this Helps!!!
The area of the floor of a square play pen is 6 square meters. What is the perimeter of the play pen? Approximate your answer by rounding to the nearest integer.
Help must be done in less than 10 minutes
Answer:
10 m
Step-by-step explanation:
Area of a square
[tex]A=s^2[/tex]
where s is the side length.
If the area of the floor is 6 m²:
[tex]\begin{aligned}A&=s^2\\\implies 6&=s^2\\\sqrt{6}&=\sqrt{s^2}\\s&=\sqrt{6}\end{aligned}[/tex]
Therefore, the side length of the square is √6 m.
Perimeter of a square
[tex]P=4s[/tex]
where s is the side length.
Substitute the found value for s into the formula to find the perimeter:
[tex]\begin{aligned}P&=4s\\\implies P&=4 \cdot \sqrt{6}\\P&=4 \sqrt{6}\\P&=9.79795897...\\ P&=10 \sf \;m\;(nearest\:integer)\end{aligned}[/tex]
Therefore, the perimeter is 10 m to the nearest integer.
What is the correct formula for the volume of a cone? Is the correct answer option A B or C?
The formula for the volume of a cone is a third of the product of pi, its height h and the square of its radius r. Then, it is:
[tex]\frac{1}{3}\pi r^2h[/tex]Answer: C
A 20-foot ladder is leaning against the side of a house so that the bottom of the ladder is 12 feet from the base of the house. Will the ladder reach a window that is 14.5 feet above the ground?
Yes, because the ladder will reach 32 feet high
Yes, because the ladder will reach 16 feet high
No, because the ladder will only reach 16 feet high
No, because the ladder will only reach 12 feet high
Yes, because the ladder will reach 16 feet high
what is Pythagoras theorem?The relationship between the three sides of a right-angled triangle is explained by the Pythagoras theorem, commonly known as the Pythagorean theorem.
According to the Pythagoras theorem, the square of the hypotenuse of a triangle, which has a straight angle of 90 degrees, equals the sum of the squares of the other two sides.
Given:
Hypotenuse= 20 feet
base= 12 feet
Using Pythagoras theorem
H²= P² + B²
20² =12² +P²
P²= 400-144
P²= 256
P= 16 FEET.
Hence, Yes, because the ladder will reach 16 feet high
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El área de un sector circular de un círculo con radio igual a 8cm y ángulo central igual a 56° es aproximadamente
The sectorial area of the circle is equal 31.3cm^2
Area of a SectorThe formula for the b of the sector of a circle is /360o (r2) where r is the radius of the circle and is the angle of the sector.
Area of a Sector of Circle = (θ/360º) × πr^2, where, θ is the sector angle subtended by the arc at the center, in degrees, and 'r' is the radius of the circle.
Data;
Radius - 8cmangle = 56 degreesThe area of the sector can be calculated using the formula given
[tex]A = \frac{\theta }{360} * \pi r^2[/tex]
Substituting the values into the formula;
[tex]A = \frac{\theta }{360} * \pi r^2\\A = \frac{56}{360}* \pi * 8^2\\A = 31.27cm\\A = 31.3cm^2[/tex]
The area is equal 31.3cm^2
Translation:
The area of a circular sector of a circle with radius equal to 8cm and central angle equal to 56 degrees.
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3.Justify each step of the solution by stating the name of the property that was used to get to each step.Given: Step 1: 1.________________________________Step 2: 2. _______________________________Step 3: 17x = 403. _______________________________Step 4: 4. _______________________________Answer:
We are given the following equation:
[tex]2(10-13x)+9x=-34x+60[/tex]In the first step we will use the distributive property on the left side:
[tex]20-26x+9x=-34x+60[/tex]In step 2, we will add like terms on the left side using associative properties of addition and subtraction and we will subtract 20 from both sides, we get:
[tex](20-20)+(-26x+9x)=-34x+(60-20)[/tex]Solving the operations we get:
[tex]-17x=-34x+40[/tex]In step 3 we will add 34x to both sides, this is the inverse additive inverse:
[tex](-17x+34x)=(-34x+34x)+40[/tex]Solving the operations:
[tex]17x=40[/tex]In step 4, we divide both sides by 17, this is the division property of equality:
[tex](\frac{17x}{17})=\frac{40}{17}[/tex]Solving the operations:
[tex]x=\frac{40}{17}[/tex]Construct a triangle with the given measures. Label all sides and angle measurements. 1. 4 cm, 6cm
Given the two sides measurement,
• Assuming that the other side represent x and the other side represent y,( 4cm;6cm) , and that we are drawing a right angle triangle .We can constuct a triangle as follows :
• We can find the value of side h by using Pythagorean theorem:
[tex]\begin{gathered} \text{ h = }\sqrt[]{x^2+y^2}\text{ } \\ \text{where x = 4}cm\text{ and y = 6}cm\text{ , } \\ \therefore\text{ h = }\sqrt[]{4^2+6^2} \\ \text{ = 7.2 }cm \end{gathered}[/tex]• Subsequently, we will find angle angle , as shown in the diagram above as follows:
[tex]\begin{gathered} \text{For angle }\beta \\ Tan\text{ }\beta\text{ = opposite /adjacent } \\ \text{Tan }\beta\text{ = }\frac{AB}{BC\text{ }} \\ Tan\text{ }\beta\text{ = }\frac{6}{4} \\ \beta\text{ = }\tan ^{-1}(\frac{6}{4}) \\ \text{ =56.3}\degree \end{gathered}[/tex]• Since we have angle ,= 56.3 °, ,we can find, angle :
,• + + 90° = 180 °,....(angles in a triangle adds up to 180°)
∴ = 180° -90° -56.3°
=33.7°
Miss sheet,owner of the Bedspread shop knows his customers will pay no more than $145 for a comforter Misu wants a 40percent markup on selling price what is most that Misu can pay for a comforter?
The price that Misu can pay for a comforter based on the markup percentage is $103.57.
How to calculate the value?From the information, the Bedspread shop knows his customers will pay no more than $145 for a comforter Misu wants a 40 percent markup on selling price.
Let the selling price be represented as x. Based on the information given, this will be illustrated as:
x + (40% × x) = 145
x + 0.4x = 145
1.4x = 145
Divide
x = 145/1.4.
x = 103.57
The selling price will be $103.57.
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⦁ A room 12′-4″ by 13′-9″ with an 8′-0″ ceiling height has one door 3′ × 7′ and two windows 4′ square. Answer the following questions. Assume there is no waste in materials, and round off your answer to the next largest unit. Show both exact and rounded figures in the blanks provided.
The amount of wall surface in square feet is there to paint is: 364 square ft. While the floor area is 169.58sq ft. See the calculations below:
What is Square Feet?The square foot is an imperial measure of area and a customary unit of area in most countries. It is defined as the area of a square with one-foot sides.
The calculation for the above solution is given as:
Step I - Recall the Given Stats:
Dimensions of the room are:
12′-4″ by 13′-9″ with an 8′-0″ ceiling height has one door 3′ × 7′ and two windows 4′ square.
Let Lenght (l) = 13'9" = 13(9/12) ft = 13(3/4) = 55/4 ft.
Let Width(w) = 12'4" = 12(4/12) ft = 12(1/3)ft = 37/3 ft
Let Height h = 8'0" = 8ft.
Recall that we have a door with dimensions 3' x 7' and two windows 4'x4'
Step II - A) Surface area of the wall to be painted is:
Area of 4 walls less (area of door plus area of window)
Surface Area = 2LH + 2WH - ((3 x7) + 2(4x4))
= 2(l +w)h - (21 + 32)
= 2 ((55/4) + (37/3))8 -53
= 220 + 592/3 - 53
= 167 + 592
= (501+ 592)/3
= 1093/3
Hence,
The Surface Area to be painted is = 364.33 Sq ft.
Step III - B) The Area of the Floor = Lx W
= (55/4) x (37/3)
= 2035/12
= 169.583333333
Hence,
Area of the Floor is approximately = 169.58
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Full Question:
A room 12′-4″ by 13′-9″ with an 8′-0″ ceiling height has one door 3′ × 7′ and two windows 4′ square.
Answer the following questions. Assume there is no waste in materials, and round off your answer to the next largest unit. Show both exact and rounded figures in the blanks provided.
A. How much wall surface in square feet is there to paint?
B. What is the floor area?
A number with an absolute value of 42 was divided by a number with an absolute value of 7 The quotient -6. Write two posibble numeric equations
Answer:
-42/7 and 42/-7
Explanation:
The absolute value of a number is represented by:
[tex]|x|[/tex]The lines represent absolute value of a number x, and what it does is that it makes everything into a positive number.
For example |-5|=5 and |5|=5, so we always have two options with an absolute value: that it comes from a negative number or that it comes from a positive number.
In this case we have that a number with an absolute value of 42 (it could be |-42|=42 or |42|=42) divided by a number with an absolute value of 7 (it could be |-7|=7 or |7|=7) the quotient is -6.
One possible numberic equation is:
[tex]\frac{-42}{7}=-6[/tex]Since this meets all the above conditions
Another possible numeric equation is:
[tex]\frac{42}{-7}=-6[/tex]Since this too meets all the above conditions.
cost equationcost of producing 7 unitswhat is the break point
Answer:
Part A: C(x) = 0.068x+0.8
Part B: 1.28
Part C: 9.76
Explanation:
Part A:
The cost C equals
cost = revenue - profit
[tex]C(x)=R(x)-P(x)[/tex]which is
[tex]C(x)=0.15x-(0.082x-0.8)[/tex][tex]C(x)=0.15x-0.082x+0.8[/tex][tex]\boxed{C\mleft(x\mright)=0.068x+0.8}[/tex]Part B:
The cost of producing 7 units is found by putting in x = 7 into the above equation. This gives
[tex]C(7)=0.068(7)+0.8[/tex][tex]C(7)=1.28[/tex]Hence, the cost of producing 7 items is 1,28 million dollars.
Part C:
To break even, the cost must equal the revenue
[tex]R(x)=C(x)[/tex]or
[tex]0.15x=0.068x+0.8[/tex]subtracting 0.068 from both sides gives
[tex]0.082x=0.8[/tex]dividing both sides by 0.082 gives
[tex]\boxed{x=9.76}[/tex]which is the break-even point
Put the following equation of a line into slope-intercept form, simplifying all fractions.
4x-20y=-160
The equation of the line 4x-20y = -160 in the slope intercept form is y = x/5 + 8 .
The equation of the line in slope intercept form is written as
y = mx + c ,
where m is the slope of the line , and c is the y intercept .
In the question ,
the equation of the line is given
equation of line is given as 4x-20y = -160
to convert the equation in slope intercept form , we rewrite it as
20y = 4x+160
dividing both sides by 20 ,
we get
20y/20 = 4x/20 + 160/20
y = x/5 + 8
hence ,the slope intercept form is y = x/5 + 8 , where 8 is the y intercept and 1/5 is the slope .
Therefore , the equation of the line 4x-20y = -160 in the slope intercept form is y = x/5 + 8 .
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PLEASE HELP ITS DUE SOON! I DONT GET ANY OF THIS! HELP WOULD BE MUCH APPRECIATED! NEED THIS DONE BEEN STUCK ON THIS FOR WAY TO LONG!
YOU WILL GET 100 POINTS IF YOU HELP! QUESTION DOWN BELOW!!!!!
1) [tex]VX=ZX, \angle XVY=\angle XZW[/tex] (given)
2) [tex]\angle X=\angle X[/tex] (reflexive property)
3) [tex]\triangle VXY \equiv \triangle ZXW[/tex] (ASA)
Find g(x), where g(x) is the reflection across the y-axis of f(x) = -9x - 4.
Write your answer in the form mx + b, where m and b are integers.
g(x) =
Answer: [tex]9x-4[/tex]
Step-by-step explanation:
Reflecting across the y-axis means [tex]f(x) \longrightarrow f(-x)[/tex].
[tex]g(x)=-9(-x)-4=9x-4[/tex]
Use fundamental identities to find the value. Step by step can u explain.
To answer this question, we will use the following diagram as reference:
To determine the tangent of θ, we have to find the value of x.
To find x, we use the Pythagorean theorem and get:
[tex]4^2=3^2+x^2.[/tex]Therefore:
[tex]x=\sqrt{4^2-3^2}=\sqrt[]{7}.[/tex]Therefore:
[tex]\tan \theta=\frac{3}{\sqrt[]{7}}.[/tex]Answer:
[tex]\tan \theta=\frac{3}{\sqrt[]{7}}.[/tex]3/5 × 2/9 and 5/6 × 4/7 and 3/10 × 5/6 and 6/7 × 7/15
1
Step
Multiple both numerator and both denominator
[tex]\frac{3}{5}\text{ x }\frac{2}{9}\text{ = }\frac{3\text{ x 2}}{5\text{ x 9}}\text{ = }\frac{6}{45}\text{ = }\frac{2}{15}[/tex]2
[tex]\frac{5}{6}\text{ x }\frac{4}{7}\text{ = }\frac{5\text{ x 4}}{6\text{ x 7}}\text{ = }\frac{20}{42}\text{ = }\frac{10}{27}[/tex]3
[tex]\frac{3}{10}\text{ x }\frac{5}{6}\text{ = }\frac{3\text{ x 5}}{10\text{ x 6}}\text{ = }\frac{15}{60\text{ }}\text{ = }\frac{1}{4}[/tex]4
[tex]\frac{6}{7}\text{ x }\frac{7}{15}\text{ = }\frac{6\text{ x 7}}{7\text{ x 15}}\text{ = }\frac{42}{105}\text{ = }\frac{2}{5}[/tex]2. Math on the Spot Solve each equation.
A. 3n+ 1 = 19
B. 21 = -2p - 5
A.
[tex]3n =19 - 1 \\ 3n = 18 \\ \frac{3n}{3} = \frac{18}{3} \\ n = 6[/tex]
B.
[tex]21 + 5 = - 2p \\ 2p = - 26 \\ \frac{2p}{2} = \frac{26}{2} \\ p = 13[/tex]
HOPE THIS HELPS.
A worker's salary increased from $750 to $900 per month. Which equation shows the increase of the worker's salary to the nearest percent?
where A is the first value, B the second value and x the percent
we can solve x
[tex]\begin{gathered} \frac{x}{100}A=B-A \\ x=\frac{100\times(B-A)}{A} \end{gathered}[/tex]this is the equation
and this is the percent:
[tex]\begin{gathered} x=\frac{100\times(900-750)}{750} \\ \\ x=20 \end{gathered}[/tex]the percent is 20%
a line contains the point ( -3, -1 ) and has a slope of 1/3. which equation represents this line?
Given:
Slope = 1/3
Contain the point = ( -3,-1 )
Find-:
The equation of a line.
Explanation-:
The general equation of a line is:
[tex]y=mx+c[/tex]Where,
[tex]\begin{gathered} m=\text{ Slope} \\ \\ c=\text{ y-intercept} \end{gathered}[/tex]Given the slope is 1/3, then the equation of the line become.
[tex]\begin{gathered} m=\frac{1}{3} \\ \\ y=mx+c \\ \\ y=\frac{1}{3}x+c \end{gathered}[/tex]The value of y-intercept is:
The point (-3,-1) contains the line so its satisfied the equation.
[tex]\begin{gathered} (x,y)=(-3,-1) \\ \\ \end{gathered}[/tex][tex]\begin{gathered} y=\frac{1}{3}x+c \\ \\ -1=\frac{1}{3}(-3)+c \\ \\ -1=-1+c \\ \\ c=-1+1 \\ \\ c=0 \end{gathered}[/tex]So equation of line become:
[tex]\begin{gathered} y=mx+c \\ \\ y=\frac{1}{3}x+0 \\ \\ y=\frac{1}{3}x \\ \\ 3y=x \\ \\ x-3y=0 \end{gathered}[/tex]The final equation of line is:
[tex]x-3y=0[/tex]Which of the following is the correct mathematical expression for:
The difference between three times a number and 4
Answer:
3x - 4
Step-by-step explanation:
"Difference" is a clue word that tells you to use subtraction. The other clue word is "times" but that means times, or multiplication and is pretty straight forward.
"Three times a number" means to multiply a number, but we don't know the number, so we use a variable (a letter). I put x but you could use n or c or almost any letter for the variable.
"the difference of ___ and ___" means to subtract those two things.
So we get 3x - 4
4-[x]=1 absolute value equation
Answer: x=-3, x=3
Step-by-step explanation:
Answer:
4-[x]=1
-4. -4
-[x]=-3
x=3