Need before 7: 30pm . with questions 23-26 and i have to show my work

23)  3 + (a/3) =7

      -3             -3

      (a/3) = 4

      x3       x3

       a = 12

24)  -1 + (n/3) = 1

      +1             +1

      (n/3) = 2

       x3      x3

       n = 6

25)  (9+k/3) =3

        x3        x3

       9 + k = 9

      -9         -9

      k = 0

26)  (x-3/ 22)= -1

       x22        x22

      x-3= -22

      +3    +3

       x= -19

your answer is 228

step-by-step explanation:

add the top and bottom bases together, then divide them by 2, then multiply by the height.