Answer:
C
Step-by-step explanation:
f(x)=72-4x
72-4x=0
4x=72
x=18
f(x)<=18
3 + 5 + 7 = 15
they have 15 quarters altogether so answer is 15q
The answer is 106.46. A
Answer: (4,-5)
8y = -40
(divide by 8)
y = -5
(plug it in to one of the equations)
3x + 6*-5 = -18
3x + -30 = -18
3x = 12
x = 4
16
4x6=24