Factor out the greatest common factor.

3x + 27x2

3x

Step-by-step explanation:

3x+27 x²

=3x(1+9x)

To find the percent of something, put the percent in decimal form and multiply.

125% = 125/100 = 1.25

Now here's the problem with the wording: He spent 125% of the previous time doing his homework, but only 25% more time!

(If you wanted to find out how much MORE time, subtract 25 from 20 and you'll see that he did 5 more hours this week. 20 times 0.25 = 5. (0.25 = 25%))
So no, Evan did not spent 125% more time doing his homework this week.