Ineed to know how to find the answer and what are the answers

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

The trigonometric ratios sine and secant are reciprocals of each other

The price of a dozen eggs was $1.63. suppose the price increases m dollars per dozen and then the price decreases $0.12 per dozen. which expression represents the current price of eggs after the two price changes?