What homemade things could i use for wheels on a small balloon powered car?

You can use mostly anything as long as it is circular. Depending on how big it is, you could use sturdy paper plates and use a stick/rod and tape to hold it together, or you could use bottle caps if the car you are trying to make is really small.

d. learned preferences i believe is your answer

answer: a) y=-8x+5

a) m= -8

b) m= -2

c) m= 7

d) m= 6