Please please please please please help me with my math homework ​

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

With this question substitute t=3 and t=5 to determine if the two expressions are equivalent. 4(t + 3) 4t+12 which statements are true? check all that apply. a. the value of both expressions when t =5 is 32. b. the two expressions are not equivalent. c. the value of both expressions when t=3 is 15. d. the value of both expressions when t=5 is 23. e. the two expressions are equivalent. f. the value of both expressions when t=3 is 24.

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?