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Annette [7]
3 years ago
7

I don't usually get stuck on stuff like this bu For whatever reason I have no idea

Mathematics
2 answers:
Elza [17]3 years ago
6 0

Answer:

the answer is x= -1

Step-by-step explanation:

I know this because 72x-1 is the same as 72 divided by 1 which is 1

Archy [21]3 years ago
4 0

Answer:

1/72=x (part a)

1/70=x (bart b)

Step-by-step explanation:

Divide 1 by 72 for part a, and divide 1 by 70 for part b.

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A dvd normally costs $15. It is reduced to $9.75 in a sale. How much is the percentage reduction
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You are paying 65% of the original price.

Step-by-step explanation:

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Sarah walks 20 feet away from her house and places a mirror on the ground. She backs 5 feet away from the mirror so that she can
Vikki [24]

Answer:

16 feet

Step-by-step explanation:

As said in the problem statement, the angles between the top of the house, the mirror, and the ground and between Sarah's eyes, the mirror, and the ground are congruent.

We also know that Sarah and the house are perpendicular to the ground.

So if we draw a triangle from the top of the house, to the mirror, to the bottom of the house, and another triangle from Sarah's eyes, to the mirror, to Sarah's feet, we get two triangles that have the same angles.  Therefore, the triangles are similar, and we can write a proportion:

4 / 5 = h / 20

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The house is 16 feet tall.

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3 years ago
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