Please help important

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.

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.