Answer: 6
Step-by-step explanation:
Slope is found by doing:

(x1 and y1 must be from the same ordered pair and x and y must be from the same ordered pair, however point (x1,y1) and (x,y) can be used interchangeably)
Let us say that (x1,y1) is (3,18)
And (x,y) is (5,30)

Answer:
260
Step-by-step explanation:
28+29(23)
=28+(29)(8)
=28+232
Joshua must have 7 more customers if they each buy 2 items.