Answer:
total marbles in the box is 600
a
x 0.5x + 10 y
0 0.5(0) +10 = 10 (0,10) the y intercept
1 0.5(1) + 10 = 10.5 (1, 10.5)
4 0.5(4) + 10 = 12 (4, 12)
5 0.5(5) + 10 = 12.5 (5, 12.5)
6 0.5(6) + 10 = 13 (6, 13)
b
see attached graph
c
Since they add ten for each call before they multiple miles it is not proportional.
d.
No because the graph shows negative numbers and presumably the company can't charge you if they don't drive there.
14×4=56
it took ingrid 56 minutes to wash her car
i hope this helped :)