The function for the cost of materials to make a muffin is f(x) = Three fourths x + 3, where x is the number of muffins. The function for the selling price of those muffins is g(f(x)), where g(x) = 3x + 4. Find the selling price of 20 muffins.

Question

The function for the cost of materials to make a muffin is f(x) =  Three fourths x + 3, where x is the number of muffins. The function for the selling price of those muffins is g(f(x)), where g(x) = 3x + 4. Find the selling price of 20 muffins.

ganeshie8 · Answer

$ \large f(x) =  \frac{3}{4}x+3$

$g(x) = 3x+4$

selling price = $g(f(x)) = ?$

ganeshie8 · Answer

u knw how to find/interpret $g(f(x))$ ?  :)

anonymous · Answer

No I don't.

ganeshie8 · Answer

its okay, u wil get it easily once u see it done

ganeshie8 · Answer

$g(f(x))$
     ^^


$\
\large  g(\frac{3}{4}x+3) $

anonymous · Answer

Is it 18?

ganeshie8 · Answer

$\large  3\left(\frac{3}{4}x+3\right) + 4$

ganeshie8 · Answer

thats the g(f(x))

now plugin x=20 above

anonymous · Answer

Okay. Now I got 58..

ganeshie8 · Answer

58 = $\large \color{red}{\checkmark}$

anonymous · Answer

Thank you!

ganeshie8 · Answer

np :)