If the geometric mean of a and 28 is 16 sqrt 7 find a

a = 64

Step-by-step explanation:

The geometric mean of 2 numbers a and b is , then

= 16 ( square both sides )

28a = (16 )² = 1792 ( divide both sides by 28 )

a = 64

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

idk

step-by-step explanation: