What's the geometric mean of 5 and 10?

The geometric mean of 5 and 10 is the positive square root of the product.

SQR(5*10) = SQR (50) = SQR(25 * 2) = 5 SQR (2)

If you are in Geometry and using proportions,

5/x = x/10 where x is the geomtric mean.
x^2 is 50 and x = 5  SQR(2)

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!