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400 = 9r^2 + 16 r^2
400 = 25 r^2
r^2 = 400/25
r^2 = 16
r = 4
b). (13r)^2 = (10)^2 + (12r)^2
169 r^2 =100 + 144r^2
169 r^2 -144 r^2 = 100
25 r^2 = 100
r^2 = 100/25
r^2 = 4
r = 2
c) (17r)^2 = (8)^2 + (30)^2
289r^2 = 64 r^2+ 900
289 r^2 - 64r^2= 900
225 r^2 = 900
r^2 =900/225
r^2 = 4
r = 2