Damon buys lumber worth $562.He gets 20% contractors discount. The sales tax is 6% off. His credit card gives 2% off. How much does he pay

Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?

The volume of a spherical hot air balloon v(r) = 4 3 ? r3 changes as its radius changes. the radius is a function of time given by r(t) = 3t. find the instantaneous rate of change of the volume with respect to t at t = 2.