What is the future value of a single amount of:

a$.$ $$5,000$ invested for $15$ years at $5\%$ compounded annually?

b$.$ $$5,000$ invested for $15$ years at $8\%$ compounded annually?

c$.$ $$5,000$ invested for $10$ years at $5\%$ compounded annually?

d$.$ $$5,000$ invested for $10$ years at $8\%$ compounded annually?