Answer:
The equation the repair service use to charge customers is c = 30h + 40
Explanation:
If h = 1
Cost, c = 30h + 40
 = 30(1) + 40
 = $70
h = 2
c = 30(2) + 40
 = $100
 h = 3
c = 30(3)+ 40
 = $130
 h = 4
c = 30(4) + 40
 = $160
h = 5
c = 30(5) + 40
 = $190
h = 6
c = 30(6) + 40
 = $220