Write the equation of the quadratic function with roots -1 and 1 and a vertex at (0, -3)

the given problem looks very confusing because of the

unnecessary symbols and repeated letters or words. but i believe the correct

given variables are:

c = the number of boxes of cookies that are bought

d = which represents the cost of the amount of box of

cookies bought

the two variables are related by the given equation:

d = 4 * c

we are to find for d when c = 12. we can solve for d by

simply plugging in the value of c in the equation, that is:

d = 4 * 12

d = 48