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3^n = 3⁵
n = 5
b. 2^(n+1) = 1 / 16
2^(n+1) = 1 / 2⁴
2^(n+1) = 2⁻⁴
n + 1 = -4
n = -4 - 1
n = -5
c. 4^n = (-2)°
4^n = 1
4^n = 4°
n = 0
d. 48 : 3 = n^4
16 = n^4
2^4 = n^4
2 = n