Answer Box

Practice Test 1 - Question 29

The triangle is set up to be a 3,4,5 right triangle. Thus 5x = 30 and x = 6.
OR use the the Pythagorean Theorem to solve:
(3x)² +(4x)² = 30²
9x² + 16x² = 900
25x² = 900
x² = 36
x = 6 (positive lengths only)

3x = 18