The measures of two sides of a triangle are given as 2x + 4y and 3x - y. The perimeter is 8x + y. Find the measure of the third side.

Someone answer this check out the image!

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a

Joanie wrote a letter that was 1 1/4 pages long. katie wrote a letter that was 3/4 page shorter then joagies letter. how long was katies letter