Answer:
3x²+5x
Step-by-step explanation:
G A pool fills at a rate of 90 gallons per hour
i dont know
4.
f(x) = (x + 2)(x + 1)(x - 3) = x^3 - 7·x - 6
a = 0 ; b = -7 ; c = -6
5.
a = -3 ∧ b = -2 ∧ c = -3
x= 7
2x=14
x= 14/2
