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Aneli [31]
3 years ago
13

PLEASE HELP MEEEEE

Mathematics
1 answer:
Elena-2011 [213]3 years ago
5 0

Answer:

a = 36 and a = 27

Step-by-step explanation:

The geometric mean of two numbers is the square root of the product of the two numbers.

Say for example we have the numbers x and y, the geometric mean z is mathematically;

z = √xy

For the first question, our z is 12, x and y are 4 and a respectively.

12 = √4a

square both sides

144 = 4a

a = 144/4

a = 36

For the second question

z is 9, x and y are 3 and a respectively

9 = √3a

square both sides

81 = 3a

a = 81/3

a = 27

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kolbaska11 [484]
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dusya [7]
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Answer A is the correct one :)
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