Answer:
4 units count the boxes from a to b and that's 4
1.) The answer is A. 5+2x = 17. The x in the equation signifies the number of times Steven went to the big slides. The 5 represents the fixed cost of the slide. The total expenditure in the water park is 17 dollars, and the 2 represents the cost of using 1 big slide.
2.) The answer is still letter A. 5 +2x =17.