Answer:
f(x)= 5x^(2)-10x-120
d = 3
Step-by-step explanation:
3.5d + 6.25 = 1 + 5.25d
5.25d - 3.5d = 6.25 - 1
1.75d = 5.25
d = 5.25 ÷ 1.75 = 3
95
72+88+95=255:3= 85
the speed of the first ship is 20 mph
and the second ship is 15 mph
50x-2
