Fast ! the cost of go-karting is dollars for the
first ten laps around the track and
dollars for each additional lap. what is the
cost, in dollars, of go-karting for 17 laps?
(a) + ( × 7)
(b) + ( × 7)
(c) ( × 10) +
(d) 17 + +

you pay x for ten laps an you pay y for every additional lap you just multiply y by seven an add x

so all an all your answer would be (B) 

a negative exponent is translated as follows:

so, we have

from the figure we get,

the x axis shows   the months and,

the y-axis shows the number of satisfied customer.

each line or each cell in upward direction (y-axis) shows 500.

the appropriate scale for the y - axis is: -

a = 2000 customers

b = 4000 customers

c = 6000 customers

d = 8000 customers

e = 10000 customers

f = 12000 customers

g = 14000 customers