The linear equation c=9s + 12 models the cost, c , of hamburgers as a function of the amount sold. S, in the store what is the slope and constant ?

Urgent? will give brainliest given that the blue triangle is a right triangle, which expression correctly gives the area of the red square? a) a2 + b2 b) a2 - b2 c) a2 - c2 d) c2 - a2