Ummm i needd summm help:))

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

Mario is constructing a frame for 10 in. by 8 in. photo. he wants the frame to be the same with all the way around in the same area of the frame and photo to be 120 square inches what is the dimension of the frame?

Find the distance between the point (-3,-4), and (see the picture below)