match the lettered entries in matrices a, b, and ab to their values.
Given:
The matrics
[tex]\begin{gathered} A=\begin{bmatrix}{a} & {2} & {3} \\ {4} & {b} & {6} \\ {c} & {8} & {-7}\end{bmatrix} \\ B=\begin{bmatrix}{5} & {1} & {-2} \\ {-1} & {3} & {4} \\ {2} & {d} & {e}\end{bmatrix} \\ AB=\begin{bmatrix}{14} & {-1} & {f} \\ {20} & {22} & {70} \\ {-27} & {44} & {-1}\end{bmatrix} \end{gathered}[/tex]Required:
Match lettered entries in the matrices A, B and AC to their values.
Explanation:
First multiply matrices A with B
[tex]\begin{gathered} AB=\begin{bmatrix}{a} & {2} & {3} \\ {4} & {b} & {6} \\ {c} & {8} & {-7}\end{bmatrix}\begin{bmatrix}{5} & {1} & {-2} \\ {-1} & {3} & {4} \\ {2} & {d} & {e}\end{bmatrix} \\ \begin{bmatrix}{5a-2+6} & {a+6+3d} & {-2a+8+3e} \\ {20-b+12} & {4+3b+6d} & {-8+4b+6e} \\ {5c-8-14} & {c+24-7d} & {-2c+32-7e}\end{bmatrix}=\begin{bmatrix}{14} & {-1} & {f} \\ {20} & {22} & {70} \\ {-27} & {44} & {-1}\end{bmatrix} \end{gathered}[/tex]Now we can find values of a, b, c, d, e and f from equating two matrices as:
[tex]\begin{gathered} 20-b+12=20 \\ b=12 \end{gathered}[/tex][tex]\begin{gathered} 5a-2+6=14 \\ a=2 \end{gathered}[/tex][tex]\begin{gathered} a+6+3d=-1 \\ 2+6+3d=-1 \\ 3d=-9 \\ d=-3 \end{gathered}[/tex][tex]\begin{gathered} -8+4b+6e=70 \\ -8+48+6e=70 \\ 6e=30 \\ e=5 \end{gathered}[/tex][tex]\begin{gathered} 5c-8-14=-27 \\ 5c=-5 \\ c=-1 \end{gathered}[/tex][tex]\begin{gathered} -2a+8+3e=f \\ -2(2)+8+3(5)=f \\ -4+8+15=f \\ 4+15=f \\ f=19 \end{gathered}[/tex]Answer:
The values are a = 2, b = 12, c = -1, d = -3, e = 5 and f = 19.
Find the surface area and volume of the solid. Round each measure to the nearest tenth, if necessary.
The volume and the surface area of the right cylinder are equal to 468π cubic inches and 228π square inches. (Correct choice: B)
How to determine the surface area and the volume of a right cylinder
In this problem we find a right cylinder, whose height (h), in inches, and radius (r), in inches, are described in the figure and are needed to calculate the volume (V), in cubic inches, and the surface area (A), in square inches, of the solid. The formulas are described below:
Volume
V = π · r² · h
Surface area
A = 2π · r² + 2π · r · h
If we know that r = 6 in and h = 13 in, then the volume and the surface area of the cylinder are, respectively:
Volume
V = π · (6 in)² · (13 in)
V = 468π in³
Surface area
A = 2π · (6 in)² + 2π · (6 in) · (13 in)
A = 228π in²
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Solve. 5(y - 10) = -5 Answer: Submit Answer att
We divide both sides by 5 so we can eliminate the parenthesis:
[tex]\begin{gathered} 5(y-10)=-5 \\ \frac{5(y-10)}{5}=-\frac{5}{5} \\ y-10=-1 \end{gathered}[/tex]Step 2We rearrange the terms so the terms with the unkown variable y are on the left side and the other ones on the right side:
y - 10 = -1
↓ adding 10 both sides
y - 10 + 10 = -1 + 10
y + 0 = 9
y = 9
Answer: y = 9Need an explanation to this equation? Radius how do I find it?
Solution
[tex]x^2-10x+y^2+6y-30=0[/tex]Now, the circle equation
[tex]\left(x−a\right)^2+\left(y−b\right)^2=r^2\:\:\mathrm{is\:the\:circle\:equation\:with\:a\:radius\:r,\:centered\:at}\:\left(a,\:b\right)[/tex][tex]undefined[/tex]Rewrite in standard form
[tex]\left(x-5\right)^2+\left(y-\left(-3\right)\right)^2=8^2[/tex]Therefore the circle properties
[tex]\left(a,\:b\right)=\left(5,\:-3\right),\:r=8[/tex]The final answer
[tex]\mathrm{Circle\:with\:center\:at}\:\left(5,\:-3\right)\:\mathrm{and\:radius}\:r=8[/tex]According to a recent survey, the number of pet dogs and cats in
the United States is about 183,900,000. Write an estimate for the number of pet dogs and cats as a single digit times an integer
power of 10. Show your work.
An estimate for the number of pet dogs and cats in the United States based on a recent survey, written as a single digit times an integer power of 10 is 2 x 10⁸.
What is an estimate?An estimate is a rough calculation or judgment arrived at when the details are not required or available.
We can apply number approximation, rounding, and scientific notations in estimation, as above.
First, the number, 183,900,000, can be approximated to 200 million pet dogs as an estimate.
Then, 200,000,000 can be written in a standard form or scientific notation by using an integer that indicates the place value in the power of 10.
Thus, 183,900,000 pet dogs can be estimated as 2 x 10⁸.
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Tavon has a gift card for $175 that loses $4 for each 30-day period it is not used. He has another gift card for $155 that loses $3.50 for each 30-day period it is not used. a. Write and solve an equation for the number of 30-day periods until the value of the gift cards will be equal. b. What will the value of each card be when they have equal value? a. If x is the number of 30-day periods, then the equation can be used to find the number of 30-day periods until the values of the gift cards will be equal. (Type an equation. Use integers or decimals for any numbers in the equation.)
Answer:
A) 40
B) $ 15
Step-by-step explanation:
A)An equation for the number of 30-day periods until the value of the gift cards will be equal
Let x be the number of time periods for which the gift card is not used, then
For the gift card $ 155 if it is not used for x periods, then the amount that will be lost is
155 - 3.50 x---------------------(1)
For the gift card $ 135 if it is not used for x periods, then the amount that will be lost is
135 - 3x---------------------- (2)
Now when both the amount lost is equal
solving the equation, we get
20 = 0.5x
x = 40Thus the value of gift cards will be equal for 40 ,30 day periods. B)The value of each card be when they have equal value The two cards will have equal value after 40 30 day periods, this denotes that at this time, the value of each card will be equal.Then substituting x = 40, we get when they have equal value, the value of each card will be $15
You are at the county fair on a Friday evening and the Ferris-wheel ride catches your
eye. The Ferris-wheel is 200 feet in diameter and the base of the Ferris-wheel is
raised 25 feet above the ground level. You board a compartment at the bottom of the
Ferris-wheel and rotate through 125 degrees counterclockwise. What is your total arc
length to the nearest foot (a whole number), that you have travelled, at the instant you
have rotated 125 degrees? Enter a number, for example, 47 into the textbox. Hint:
This question is about arc length not height.
Round your answer to the nearest foot (an integer).
Enter a whole number into the textbox.
the total arc length to the nearest foot if it is rotated 125° will be 218 feet.
Diameter of the Ferris wheel = 200 feet
radius of the Ferris wheel will be = 200 / 2 = 100 feet
Now, it has travelled 125° counterclockwise.
So, the arc length travelled will be:
Arc length = 2 π r ( 125° / 360°)
Arc length = 2 (22 / 7) (100) (125 / 360)
Arc length = 218.25 feet
rounding off to the nearest whole number, we get that:
Arc length = 218 feet.
Therefore, we get that, the total arc length to the nearest foot if it is rotated 125° will be 218 feet.
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Combine like terms to create an equivalent expression.
Enter any coefficients as simplified proper or improper fractions or integers. 2/5m - 4/5 - 3/5 m
After combining the given expression [2/5m - 4/5 - 3/5m], the resultant expression is [-1/5m - 4/5].
What are expressions?A number, a variable, or a combination of numbers, variables, and operation symbols make up an expression. Two expressions joined by an equal sign form an equation. Word illustration: The product of 8 and 3. Word illustration: The product of 8 and 3 is 11So, 2/5m - 4/5 - 3/5m:
Now, evaluate the expression as follows:
2/5m - 4/5 - 3/5m2/5m - 3/5m - 4/5(2 - 3)/5m - 4/5-1/5m - 4/5Therefore, after combining the given expression [2/5m - 4/5 - 3/5m], the resultant expression is [-1/5m - 4/5].
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Ms.Torres was driving at a constant speed she drove 178 1/2 miles in 4 1/2 hours after 4 1/4 hours she stay driving in the city and decided to lower her speed she brought down her speed to 3/4 of her original speed what was her new speed
The new speed of Ms.Torres is 119/4 miles/ hour for the driving.
What is referred as the term speed?The definition of speed is the rate at which an object's position changes in any direction. Speed is described as the ratio of distance traveled to time spent traveling. Because it has only one direction and no magnitude, speed is a scalar quantity.For the given question;
The distance covered by Ms.Torres; 178 1/2 miles
Convert mixed fraction to fraction; 357/2 miles.
The time taken by Ms.Torres; 4 1/2 hours
Convert mixed fraction to fraction; 9/2 hours.
Speed = distance/ time
Speed = 357/2 miles/9/2 hours
Original Speed = 119/3 miles/ hour.
Now, the speed covered by her is 3/4 of the original speed.
Thus,
= (3/4)×(119/3)
= 119/4
Therefore, the new speed of Ms.Torres is 119/4 miles/ hour.
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Need help for this
Answer:
[tex]1. a=-10[/tex]
[tex]2. b=-0.2[/tex]
[tex]3. c=0.25[/tex]
Step-by-step explanation:
1. 1/5a = -2
a=-10
2. 8+b=7.8
b=-0.2
3.-0.5=-2c
c=0.25
:]
(Brainliest would help a lot) Tell me if this is incorrect!
The midpoint of AB is M(-3, 5). If the coordinates of A are (-4, 6), what are the
coordinates of B?
Answer:
(-2, 4)
Step-by-step explanation:
Midpoints
x = (x1 + x2)/2
y = (y1 + y2)/2
so
-3 = (-4 + x2)/2
x2 - 4 = -6
x2 = -2
5 = (6 + y2)/2
y2 + 6 = 10
y2 = 4
2 x 10 to the power of negative 6 times what number is equal to 6 x 10 to the power of negative 4?
What is 50% of 100%?
Answer:
We need to determine 50% of 100 now and the procedure explaining it as such
Step 1: In the given case Output Value is 100.
Step 2: Let us consider the unknown value as x.
Step 3: Consider the output value of 100 = 100%.
Step 4: In the Same way, x = 50%.
Step 5: On dividing the pair of simple equations we got the equation as under
100 = 100% (1).
x = 50% (2).
(100%)/(x%) = 100/50
Step 6: Reciprocal of both the sides results in the following equation
x%/100% = 50/100
Step 7: Simplifying the above obtained equation further will tell what is 50% of 100
x = 50%
Therefore, 50% of 100 is 50
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Help on math problem precalculus
Remember that the domain is the numbers that x can take
x=5 has a domain of only 5
y = 1/x cannot have a value of x=0 because 1/0 is undefined
t = sqrt(x) cannot have negative values because sqrt( negative numbers) is not defined in the real number system
y = |x| is defined for all values of x so it has a domain of all real numbers
A submarine descended 500 feet below sea level
The submarine is at a position of -775 feet or 775 feet below sea level.
Here, we assume that the submarine was originally at the sea level, which means it was at position 0.
It then descended 500 feet below sea level. Which means it is now at a position of 500 feet below sea level. This, can be written as-
0 - 500
= -500 feet
Further, it is given that the submarine descended another 275 feet. This means that from -500 feet it further descended 275 feet. This can be written as-
-500 - 275
= -775 feet
Thus, the submarine is at a position of -775 feet or 775 feet below sea level.
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Your question was incomplete. Check for full content below-
A submarine descended 500 feet below sea level. It then descended another 275 feet. Write and then evaluate a subtraction expression to determine the new position of the submarine.
Use basic facts and patterns to find 30x30
Answer: Well, 10 x 3, 10 x 3
Step-by-step explanation: I think thats what you are asking?
A department store is having an after-Christmas sale in which
coats are discounted 30% and suits are discounted 25. If Joe
purchases a coat that was originally $300 and a sair that was
originally $400, how much money did he spend
In total, he spend $510 after discount.
What is discount?A deduction taken from the gross amount or worth of anything, such as a price decrease made from the standard or list price, giving clients a 10% discount to purchase tickets. A proportionate withdrawal from a loan account, typically done in exchange for cash or quick payment.
Given Data
Coats are discounted 30%
Suits are discounted 25%
Joe purchased a coat of $300
= 300 - [tex]\frac{30}{100}[/tex] × 300
= 300 - 90
= 210
He purchased coat for $210.
He purchased a suit $400.
Suits are discounted 25%
= 400 - [tex]\frac{25}{100}[/tex] × 400
= 400 - 100
= 300
He purchased suit for $300.
In total, he spend $510 after discount.
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If (8^7)^2 = 2^y, what number is y?
For the given expression (8^7)^2 = 2^y , the number equals to y is 42.
As given in the question,
Given expression :
(8⁷)² = [tex]2^{y}[/tex]
Simplify the given expression by using law of exponents :
Here the law of product of exponents or product law of exponents (power or index) has been applied under which [tex](8^{7})^{2} = 8^{7times2} = 8^{14}[/tex]
( 8¹⁴ ) = [tex]2^{y}[/tex]
⇒ (2³)¹⁴ = [tex]2^{y}[/tex]
⇒ 2⁴² = [tex]2^{y}[/tex]
Comparing the exponents i. e. power (or index), since the base is common, Also when two exponential numbers with common base are equal, their exponents (power or index) can be equated.
Number equals to represent the value of y is 42
Therefore, for the given expression (8^7)^2 = 2^y , the number equals to y is 42.
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In the figure below, G is between E and H, and F is the midpoint of EG. If EH = 10 and FG = 4, find GH.
Answer:
GH = 2
Step-by-step explanation:
since F is the midpoint of EG , then EF = FG = 4
EF + FG + GH = EH , that is
4 + 4 + GH = 10
8 + GH = 10 ( subtract 8 from both sides )
GH = 2
0.867, 0.086, 0.008, and 0.870 smallest to largest
Answer:
Smallest to largest would be:
0.008, 0.086, 0.867, 0.870
Step-by-step explanation:
math.
1) Draw a small graph on your paper, and graph the following line: y = 2x + 3
The equation y = 2x + 3 is in its slope-intercept form in which slope = 2 and y-intercept is 3.
If the slope is 2, then this means that the rise = 2 and the run = 1.
[tex]slope=\frac{rise}{run}=\frac{2}{1}=2[/tex]Knowing the slope and the y-intercept, let's now graph the line.
Let's remove the indication of the slope, here is the graph of the line y = 2x + 3.
find each angle measure
The measure of angle A in triangle ABC is 90 degrees.
What is the measure of angle A?An isosceles triangle is a triangle that has at least two sides of equal length.
Since side AC the same as side AB, this forms an isosceles triangle and angle C is the same as angle B.
Hence;
Angle A = 4xAngle C = 2xAngle B = 2xNote that, the sum of the interior angle of a triangle is 180°
Hence
Angle A + Angle B + Angle C = 180°
4x + 2x + 2x = 180
Solve for x
8x = 180
Divide both sides by 8
8x/8 = 180/8
x = 180/8
x = 22.5
Now, we find measure of angle A.
Angle A = 4x
Plug in x = 22.5
Angle A = 4( 22.5 )
Measure of angle A = 90°
Therefore, the measure of angle A in the isosceles triangle is 90°.
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-4+8=
-23+-1=
help me guys
Step-by-step explanation:
-4+8=4
-23+-1=-24
this is correct answer
In a poll, 1,004 men in a country were asked whether they favor or oppose the use of "federal tax dollars to fund medical research using stem cells obtained from human embryos." Among the respondents, 48% said that they were in favor. Identify the population and the sample.
Question content area bottom
All adults in the country and considered as population. 1003 men in the country are adults that are selected.
What is sample?Sampling is the process of choosing a portion of a statistical population to estimate attributes of the entire population in statistics, quality control, and survey methods. Statisticians try to get samples that are typical of the population under consideration.
Given Data
In a poll, 1,004 men in a country were asked whether they favor or oppose the use of "federal tax dollars to fund medical research using stem cells obtained from human embryos." Among the respondents, 48% said that they were in favor.
1)Population
All adults in the country and considered as population.
2) Sample is
1003 men in the country are adults that are selected.
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Jane wants to rent a boat and spend less than $75. The boat costs $8 per hour, and Jane has a discount coupon for $5 off. What are the possible numbers ofhours Jane could rent the boat?Use t for the number of hours.Write your answer as an inequality solved for t.
Jane wants to rent a boat and spend less than $75.
The boat costs $8 per hour, and Jane has a discount coupon for $5 off
Let t for the number of hours
Then we can write the following inequality
[tex]8t-5<75[/tex]The discount coupon is being subtracted since it was off.
Let us solve the inequality for t
Step 1: Add 5 to both sides of the inequality
[tex]\begin{gathered} 8t-5+5<75+5 \\ 8t<80 \end{gathered}[/tex]
Step 2:
Divide both sides of the inequality by 8
[tex]\begin{gathered} \frac{8t}{8}<\frac{80}{8} \\ t<10 \end{gathered}[/tex]This means that Jane could rent the boat for less than 10 hours
[tex]t<10[/tex]Which one doesn't belong and explain
Answer:
The first one
Step-by-step explanation:
The first quotient (7) is different from the other three (0.7)
Hope this helps
Only question #15,17, and 19 please show work THANK YOU
15) Magnitude of projection is 6.325
17) Projection is <-3.6, 10.8>
19) The acute angle between and vector is 34.509°.
The magnitude of the projection of A vector onto B vector could be deduced as,
Proj V(a) ÷ V(b) = (V(a) · V(b)) ÷ |V(b)|
15) Given, coordinates <8,-4> and <1,-3>
|V(b)| = √((1)² + (-3)²)
|V(b)| = √(1+9)
|V(b)| = √10
Proj V(a) ÷ V(b) = (V(a) · V(b)) ÷ |V(b)|
Proj V(a) ÷ V(b) = (8, -4) · (1, -3) ÷ √10
Proj V(a) ÷ V(b) = (8 + 12) ÷ √10
Proj V(a) ÷ V(b) = 20 ÷ √10
Proj V(a) ÷ V(b) = 2√10 = 6.325
17) Given, coordinates <-6,10> and <1,-3>
Projection = Proj V(a) ÷ V(b) = ((V(a) · V(b)) ÷ |V(b)|) × <1, -3>
|V(b)| = √((1)² + (-3)²)
|V(b)| = √(1+9)
|V(b)| = √10
Proj V(a) ÷ V(b) = (V(a) · V(b)) ÷ |V(b)| × <1, -3>
Proj V(a) ÷ V(b) = ((-6, 10) + (1, (-3)) ÷ √10) × <1, -3>
Proj V(a) ÷ V(b) = ((-6 × 1) + (10 × (-3)²) ÷ √10) × <1, -3>
Proj V(a) ÷ V(b) = ((-6 + 90) ÷ √10) × <1, -3>
Proj V(a) ÷ V(b) = ((84) ÷ √5) × <1, -3>
Proj V(a) ÷ V(b) = <-3.6, 10.8>
19) The vector are <2,3> and <-5,-2>. The acute angle between and vector is 34.509°.
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Jean is trying to prove parallelogram LMNO is a rhombus by using coordinate geometry.
Which statement must be true to prove LMNO is a rhombus?
A) (slope of line MO)(slope of line LN) = -1
B) (slope of line MO)(slope of line LN) = 1
C) the midpoint of line MO is the midpoint of line LN
D) the distance from M to O = the distance from L to N
Answer:
D
Step-by-step explanation:
A and B don't prove anything because we have the slopes of sides LM and ON to worry about. C could mean that yes, the figure is a quadrilateral, but with those parameters it could be a square, a rectangle, or trapezoid. Therefore D is the correct answer
Diagonal Mo bisects diagonal LN.
Midpoint of line MO = Midpoint of line LN
Option C is the correct answer.
What is a parallelogram?Parallelogram is a quadrilateral that has two pairs of parallel sides.
In a parallelogram, opposite sides and angles are equal.
The adjacent angles add up to 180 degrees.
We have,
In a rhombus,
- All sides are equal
- Opposite sides are parallel
- Diagonals bisect each other
- opposite angles are equal
Now,
Midpoint of line MO = Midpoint of line LN
Since diagonals bisect each other
Thus,
Diagonal Mo bisects diagonal LN.
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This table represents equivalent ratios. What are the values of a and b?
Ths values of a and b in the equivalent ratio illustrated on the table will be 6 and 12
How to calculate the value?It should be noted that from the information given, the relationship that exist between the numbers is illustrated as:
y = 0.8x
Therefore, when y is 4.8, the value of x will be:
y = 0.8x
x = 4.8 / 0.8
x = 6
When x = 15, the value of y will be:
y = 0.8x
y = 0.8 × 15
y = 12
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I need help with this one
Translation: add or subtract to the coordinates x ,y
A = (3,2)
A'= (6,-2)
(3+3, 2-4 ) = (6,2)
Solution:
(x,y) (x+3,y-4)→