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) 

898.1666667

step-by-step explanation:

5389/6 = 898.1666667

2(2x + 3) = -4 + 2(2x + 5)

4x + 6 = -4 + 4x + 10

4x + 6 = 4x + 6

4x - 6 + 6 = 4x - 6 + 6

4x = 4x

x = x

unlimited solutions.