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Ksivusya [100]
2 years ago
7

A sweater was on sale at 40% off the regular price. Ella saved $20 by buying the sweater on sale. What was the regular price of

the sweater?
Mathematics
2 answers:
Studentka2010 [4]2 years ago
6 0

Answer:

$60

Step-by-step explanation:

i-ready

sladkih [1.3K]2 years ago
5 0
$60, hope that helped! :)
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The sides of triangle ABC are 4.5feet 7.5 ft and 9 ft.The area is about 17 square feet. Explain how to use the are of triangle A
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In order to get the area of a triangle using sides, the formula that we are going to use is Heron's formula. This is after from "Hero of Alexandria".
So here is the step by step process:
First, we calculate for s (half of the triangles perimeter) s = a+b+c divided by 2.
s = 6 + 10 + 12 / 2
s =28/2
s = 14
Now that we have the s, we can now calculate for the area.
A = square root of s(s-a)(s-b)(s-c)
A= square root of 14 x 8 x 4 x 2
A= square root of 896
A = 29.93
The area of triangle DEF is 29.93 square feet or 30 square feet. Hope this answer helps. 
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