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If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68