An engineer wants to determine how the weight of a gas-powered car, x, affects gas mileage. The accompanying data represent the weights of vanous domestic cars and their miles per gallon in the city for the most recent model year Complete parts (a) through (d) below.

Can you me with this question? i'll reward *30 points i just need with this one question so that i could solve the others. * edit: i originally set up the question to reward 30 points, but for some reason i can only reward 15. if you don't get 30, then i'm sorry. i'm still kind of new to this site