The function f(x) represents the time it takes a boat to travel upstream. The function g(x) represents the time it takes a boat to travel downstream. Given f(x) = 3x − 10 and g(x) = 12x + 8, solve for (f + g)(x) to determine the total roundtrip time.

(f + g)(x) = 15x − 2
(f + g)(x) = 9x − 2
(f + g)(x) = 15x + 2
(f + g)(x) = 9x + 2

problem:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

f(5/2) = 10/3

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answer is 12345678900987654321234567890987654321

step-by-step explanation:

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