What dose 3+ 3(a) simplify to when a=5

Me #1 using vocabulary words, including the word “congruent”, state why the measure of angle d is 120 degrees. #2 what is the measure of angle e and why?

Suppose a pendulum is l meters long. the time, t,in seconds that it tales to swing back and forth once is given by t=2.01

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9