The function r(x) is defined by the expression x^2+3x-28. Use factoring to determine the Zeros of r(x). Explain what the zeros represent on a graph of r(x)

Jake bakes and sell apple pies. he sells each pie for $5.75 . the materials to make the pies cost $40. the boxes jake puts the pies in cost & 12.50 total. how many pies does jake need to sell to earn a profit of $50