Answer:
The numbers slowly decrease by 4 so we can determine that the 40th sequence is -70.
Step-by-step explanation:
A. y=-1.5x+30
B. it's negative because he is using money on the card
C.20, because that is the maximum amount of washes you can get for 30
Check the picture below.
so, if we get the whole area of the figure, which will be the combined areas of those three rectangles, and if we get the area of the triangle, and then subtract that area from of the triangle from the whole figure's area, we're in effect making a whole in the total area, and what's leftover is the shaded area.

.63-(-9.85)= 10.48 I hope this helped. :)
Ok so the rectangle is 12x6 which is 72. The entire top part is 18 which means the other triangle side is 6. 6x6 = 36 so 72+36 is 108