Hello,
To solve this function for f(4) we need to plug 4 into f(x) and the result will be our answer. We know that f(x) is

. Plugging in 4 we get

. Therefore, f(4)=41. Hope this helps!
Answer:
Step-by-step explanation:
x=1.6w and 2w+2x=34.
Simply substitute for x in the perimeter equation, and solve for w. Now compute x.
540ml with 12% solution
get 12% of 540
540 times 0.12 = 64.8 ml of pure acid