Write the graph in the form y=ax^2 +bx+c

The graph below shows the amount of money left in the school’s desk fund, f, after d desks have been purchased. for each new desk that is purchased, by how much does the amount of money left in the school’s desk fund decrease?

Find the area of the triangle formed by the origin and the points of intersection of parabolas y=−3x^2+20 and y=x^2−16.

Find │7│. a. 1 over 7 b. –7 c. 7 asap i always mark brailiest who me so