Question

Please help with these answers!!

Answer 1

16)
y = 900 • 0.85^x
y = 900 • 0.85^(7)
y = 289 bears

17)
11x^-3y^-1
11(-1)^-3 • (2)^-1
11 • 1/-1^3 • 1/2^1
11 • 1/-1 • 1/2
11 • -1 • 1/2 = -11/2

18)
(5•10^-7)(8•10^-4)
40•10^-11
4•10^-10