Answer:
x = 15.2
Step-by-step explanation:
you can use the Pythagorean Theorem on either half of the large triangle because you know one leg is 29/2 and the hypotenuse is 21
(29/2)² + x² = 21²
210.25 + x² = 441
x² = 230.75
x = [tex]\sqrt{230.75}[/tex]
x = 15.2
