Answer:
Inital height is 20
Step-by-step explanation:
h= (-5x-5)(x-4)
h= -5x^2+15x+20
(3x⁷)⁴ = 3⁴x²⁸ = 81x²⁸
because (3x⁷)⁴ = cx^n
=> c = 81
n = 28
56,000
regular 4 is correct