I need help for all three of these questions pls

Look at this expression. a3b3c a-3b-3c-1 which of the following is the simplest form of the expression above?

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.

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi