Please I need need an explanation so I can learn how to do it please

Iam so stuck. what is the worked out answer for this question?

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.

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a