Question

Find the value of y, rounded to the nearest tenth. Please help me, I'd appreciate it!!

Answer 1

If a secant and a tangent of a circle are drawn from a point outside the circle, then the product of the lengths of the secant and its external segment equals the square of the length of the tangent segment.

y² = 7(15+7)
y² = 7*22
y² = 154
y = √154
y = 12.4  ← to the nearest tenth