Answer:
We need to find the value of f(g(10)) when k = 3, where f(x) = 6x - 2 and g(x) = 5x - kx + 15.
First, we need to evaluate g(10) when k = 3:
g(x) = 5x - kx + 15
g(10) = 5(10) - 3(10) + 15
g(10) = 50 - 30 + 15
g(10) = 35
Now that we know g(10) = 35, we can evaluate f(g(10)):
f(x) = 6x - 2
f(g(10)) = 6(35) - 2
f(g(10)) = 208
Therefore, when k = 3, f(g(10)) = 208.