Question

Use the geometric mean to solve for the value of x. The triangles numbers are 5 and 12 and x. A. 17. B. 7.75. C. 2.65. D. 60.

Answer 1

x is the geometric mean of 5 and 12, so
x = sqrt(5·12) = sqrt(60) ≈ 7.746.
Rounded, x ≈ 7.75, so answer B.