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Leno4ka [110]
3 years ago
12

Solve the proportion.8/d = -12/30A. -45B. -20C. -3.2​

Mathematics
1 answer:
tamaranim1 [39]3 years ago
6 0

Answer:

B. -20

Step-by-step explanation:

8/d = -12/30

We can use cross products to solve

8 * 30 = d* -12

240 = -12 d

Divide each side by -12

240/-12 = -12d/-12

-20 = d

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3 years ago
The base of a parallelogram is 18 inches longer than three times the height. The area of the parallelogram is 216 square inches.
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Answer:

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Let b represent the base

h represents the height

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216 = (18 + 3h) * h

expand

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h^2 + 6h - 72 = 0

Now, lets solve!

h^2 + 6h - 12h - 72 = 0

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h - 12 = 0

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and

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h = - 6

Taking the positive value of h

Hence, the height is 12 inches

Lets check

when h = 12 inches

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when h = -6inches

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So height is 12 inches

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