Y=4x-2, y=x+3 the solution to the system of equation

Which expression is equivalent to 2^4y^3

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

Each month, a shopkeeper spends 5x + 14 dollars on rent and electricity. if he spends 3x−5 dollars on rent, how much does he spend on electricity? for which value(s) of x is the amount the shopkeeper spends on electricity less than $100? explain how you found the value(s).