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2 years ago

You paid $28.80 for a shirt that was on sale for 20% off of the original price. What was the original price?

Mathematics

2 answers:

spayn [35]2 years ago

8 0

(28.80*100)/20=$144.00

MA_775_DIABLO [31]2 years ago

5 0

The answer is 36.

Because 20% of 36 is equal to 7.2

And 36 - 7.2 = 28.80

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hus, D satisfying (ABC)DequalsI exists. Why does the expression for D found above also satisfy D(ABC)equalsI, thereby showing

Assoli18 [71]

Complete Question

The complete question is shown on the first uploaded image

Answer:

First Question

Option A is correct

Second Question

Option C is correct

Third Question

$D = A^{-1} * B^{-1} * C^{-1}$

Fourth Question

So substituting for D in (ABC) D = I

$(ABC) * A^{-1} * B^{-1} * C^{-1} = I$

$I = I$

This proof that ABC is invertible

Step-by-step explanation:

From the question we are told that

A , B and C are invertible which means that $A^{-1} , B^{-1}, C^{-1}$ exist

Now

From the question

(ABC) D = I

Where I is an identity matrix

Now when we multiply both sides by $A^{-1}$ we have

$A^{-1} A BCD = A^{-1} * I$

$IBCD = A^{-1}$

Now when we multiply both sides by $B^{-1}$ we have

$B^{-1 } *I BCD = A^{-1} * B^{-1}$

$I CD = A^{-1} * B^{-1}$

Now when we multiply both sides by $C^{-1}$ we have

$C^{-1} * I CD = A^{-1} * B^{-1} * C^{-1}$

$I D = A^{-1} * B^{-1} * C^{-1}$

$D = A^{-1} * B^{-1} * C^{-1}$

So substituting for D in the above equation

$(ABC) * A^{-1} * B^{-1} * C^{-1} = I$

$I = I$

This proof that ABC is invertible

4 0

2 years ago

WILL MARK BRAINLIEST.

charle [14.2K]

Answer:

option d

Step-by-step explanation:

The cross section of the rectangular prism is parallel to the base.

So, the length and width is congruent to the base. So, same length and width

3 0

2 years ago

4. What is the median in this set of numbers? 5, 1, 2, 8, 9*<br> Ο 5<br> οοοο

muminat

Answer:

Step-by-step explanation:

Arrange the numbers from smallest to largest

1,2,5,8,9

The middle number is the median

5 is the middle number

5 is the median

5 0

3 years ago

For the following system, use the second equation to make a substitution for why in the first equation. Will mark brainlyest!

Alona [7]

Answer:

Step-by-step explanation:

get y by itself in the second equation: y= 2x-3

substitute this into the y of the first equation:

2x+2x-3= 5

7 0

3 years ago

Solve for m:<br> 598 + 15.75m < 850

inna [77]

Answer:

m < 16

Step-by-step explanation:

598 + 15.75m < 850

15.75m < 850 - 598

15.75m < 252

m < 16

5 0

3 years ago