7/8x5/7 as a fraction

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

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

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /