need help asap

A couple wants to invest up to $21,000. They can purchase corporate bonds yielding a 10.65% return on the amount invested and municipal bonds yielding a 15.25% return on the amount invested. They want to invest at least as much in the corporate bonds as in the municipal bonds. They will also want to invest no more than $14,000 in the municipal bonds. How much should they invest in each type of bond to maximize the return on investment? (a) Identify and clearly define the variables needed to solve the linear programming problem. x=1y=A= (b) Find the objective function. Select whether it's maximizing or minimizing in the first answer blark and enter your equation in the second answer blank. (Hint: Your equation must be written in the form A=, where the variable you are maximizing or minimizing is alone on one side of the equat sign.) (c) The objective function is subject to constraints. Determine the constraints below, (Hint: Write the constraints line by line. Separate the non-negativity constraints with commas.)