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Goryan [66]
3 years ago
9

Twice a number is 12 more than five times the number

Mathematics
1 answer:
inna [77]3 years ago
4 0
N x 2 = 12 + 5n
2n - 5n = 12
-3n = 12
3n = -12
n = -4
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If a/4 = 9/a, then<br> a²=36<br> 4a = 9a<br> a + 4 = 9 + a<br> a - 4 = 9 - a
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Answer:

Option A is correct.

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Step-by-step explanation:

Given the expression: \frac{a}{4} = \frac{9}{a}

Cross multiplication the given expression following steps are as follow;

  • Multiply  numerator of the left-hand fraction by the denominator of the right-hand fraction
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Using cross multiplication, on the given expression;

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\frac{a^2}{4} =9                              [1]

now, multiply numerator of the right-hand fraction( i.e, 9) by the denominator of the left-hand fraction (i.e, 4 ) in [1]

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a^2 = 36

Therefore, the given expression is equal to: a^2 = 36




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