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kkurt [141]
4 years ago
7

Can someone please help me with #15 and #16?

Mathematics
1 answer:
ser-zykov [4K]4 years ago
4 0
You know the area of a trapezoid is given by the formula
  A = (1/2)(b₁+b₂)h
Solving for h, you get
  h = 2A/(b₁+b₂)

The area in both cases is 42 cm², so the height will be given by
  h = (2*42 cm²)/(b₁+b₂)


15. h = (84 cm²)/(5 cm + 7.5 cm) ≈ 6.7 cm

16. h = (84 cm²)/(5.7 cm + 10 cm) ≈ 5.4 cm
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Answer:

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Step-by-step explanation:

A way to solve this equation is to preform the inverse operations on both sides.

1. Add 19 to -19 and 5: 5<em>x </em>+ 6 - 19 + 19 = 5 + 19  ---> 5x + 6 = 24

2. Subtract 6 from 6 and 5: 5x + 6 - 6 = 24 - 6 ---> 5x = 18

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To prove it, substitute x with 3.6 in the equation: 5 · 3.6 + 6 - 19 = 5

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sukhopar [10]
All you have to do is move the denominator on the other side, by multiplying.

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