Three sets of a sum of a number and four are added to the sum of seven times the same number and 13

Segment xy is dilated through point m with a scale factor of 2. which segment shows the correct result of the dilation

Solve the triangle. a = 21°, c = 105°, c = 5

I’ve been trying all day to figure this puzzle out. i need the work for it aswell. it is a factoring polynomials tarsia. the image is below.