The formula for simple interest is I = P r t , I=Prt, where I I is the interest earned, P P is the principal, r r is the interest rate and t t is the number of years. Solve the formula for P P in terms of r , r, I I and t . t. PLEASE HELP

Acaterer charges $500 plus $30 per guest to cater a wedding. walt and traci don't want to spend more than $8000 on catering. write and solve an inequality in terms of the number of guests, g, that can be invited. a) 30g ? 8000; g ? 267 b) 500g < 8000; g < 16 c) 500 + 30g < 8000; g < 250 d) 500 + 30g ? 8000; g ? 250