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jawab
20.
g(x) = 3x- 5
(f⁻¹ o g)(x) = x + 1
f⁻¹(3x-5) = x + 1 → f(x+1)= (3x - 5)
f(1) = ..
x + 1= 1
x= 0
f(1)= 3(0) - 5
f(1) = - 5

21.
f(x) = 2/3(x-5)
f⁻¹(p) = 11 → f(11) =p

p = f(11)
p = 2/3  (11 - 5)
p = 2/3 (6)
p = 4