50 points and brianliest: which of the following expressions is in its simplest form?

8m + 4n - 5mn + 7
15bd + 5 - 2b + 3d + 23
xy + 6xy2 - 7 + 12xy
35 - a2 - ab2 + ab - 2ab2

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.