zhellyyyyy

23.04.2021 • 

Mathematics

Quadrilateral A'B'C'D'A ′
B
′
C
′
D
′
A, prime, B, prime, C, prime, D, prime is the result of dilating quadrilateral ABCDABCDA, B, C, D about point DDD by a scale factor of \dfrac{3}{2}
2
3
​
start fraction, 3, divided by, 2, end fraction.

Determine whether each claim about the properties of ABCDABCDA, B, C, D and A'B'C'D'A
′
B
′
C
′
D
′
A, prime, B, prime, C, prime, D, prime is true or false.
The perimeters of ABCDABCDA, B, C, D and A'B'C'D'A
′
B
′
C
′
D
′
A, prime, B, prime, C, prime, D, prime are the same.

The lengths of \overline{CD}
CD
start overline, C, D, end overline and \overline{C'D'}
C
′
D
′

start overline, C, prime, D, prime, end overline are equal.

Ответ:

NathalyN

23.04.2021

Mathematics

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Step-by-step explanation:

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Ответ:

jonlandis6

31.08.2022

Mathematics

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Step-by-step explanation:

Remark

The problem with this question is that you don't exactly know what the 25% does.

I think the way to do the problem is to consider where the 42 dollars comes from.

I think the beginning part of the problem is to develop an equation which you may not be able to solve.

So the cost using the 30% reduction is 0.7c where c is the original cost. But the 25% makes the actual cost for the person = 0.7c - 25% of 0.7c

The result is 42 dollars.

0.7c - 0.25*0.7c = 42

If I'm right, that can be solved.

0.7c - 0.175c = 42

0.525c = 42

c = 42/0.525

c = 80 dollars.

So before all the reductions and everything else, the case actually cost 80 dollars.

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