I need help please ASAP

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?

How can you decide witch operations to use to slice a two step equation

The radical equation 2+√2x-3 = √x+7 has a solution set [x= a0} and an extraneous root x = a1.