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b.1/2((a + c) x t)
1/2((14+ 8) x 7)=22 x 7 =154
c. a + b + c+ d=14 + 7 + 8 + 7=36
b. (a+b) x t = (8+14) x7 = 22 x 7 = 77
2 2 2