Question
suppose that S varies directly as the 2/5 power of T, and that S=8 when T=32. Find S when T=243.
Answers
Reiny
S = k(T)^(2/5)
when S = 8 , T = 32
8 = k (32)^(2/5)
8 = k(4)
k = 2
when T = 243
S = 2(243)^(2/5)
= 2(3^2) = 18
when S = 8 , T = 32
8 = k (32)^(2/5)
8 = k(4)
k = 2
when T = 243
S = 2(243)^(2/5)
= 2(3^2) = 18
Mariah
What does "k" stand for??