The function for the cost of materials to make a shirt is f(x) = five sixths x + 5, where x is the number of shirts. The function for the selling price of those shirts is g(f(x)), where g(x) = 5x + 6. Find the selling price of 18 shirts.

106
120
185
196

Question

The function for the cost of materials to make a shirt is f(x) = five sixths x + 5, where x is the number of shirts. The function for the selling price of those shirts is g(f(x)), where g(x) = 5x + 6. Find the selling price of 18 shirts.

 106
 120
 185
 196

pawanyadav · Answer

OK......what is the value of f(x) for x=18?

4everaddicted2anime · Answer

the answer is 106

princesssleelee · Answer

Im thinking the overall answer is 106

princesssleelee · Answer

Im not sure though

pawanyadav · Answer

How you get the answer?
... Show your work
I'll check if there is any mistake.

4everaddicted2anime · Answer

5((5/6)*18+5)+6
5(20)+6
100+6
=106

princesssleelee · Answer

f(x)=56x+5

g(x)=5x+6


so at x = 18 I need to solve f(x) first when x = 18 

so f(x)

56x+5

when x = 18 we have
56(18)+5
equaling 20 

 take that 20 and plug it into g(x) for every 'x' 

5x+6

will become
5(20)+6
equaling 106 :)