Select all of the following that are quadratic equations
a 5 x-1=3x+8
b 5x-3=0
c x^2-2x=4x+1
d 2x^2+12x=0
e x^3-6x^2+8=0
f 9x^2+6x-3=0

If 50% of a number is 14 then 100% of the number is

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 distance from the theater to the library. leave your answer in simplest radical form if necessary. 12 √12 74 √74