What's the answer? the question is change 425,000 ml to l

Hello, the answer your looking for is 425L. I hope it helps!

425L, you have to move the decimal place three places to the left.

So f'(x) is basically a slope. Since we want f(8) to be as small as possible, we would want smallest slope from x=3 to x=8, right?

f'(x) can only be 2 and not less so then f(x) would increase by 2 for every x increasing by 1 all the way to x=8.

So then smallest possible f(8) would be f(8) = f(3) + 2 + 2 + 2 + 2 + 2 = f(3) + 2(8-3) = 21

Hope this helps.