Help on number 12 , and if possible can you explain please? Thank you

List the sides of δrst in ascending order (shortest to longest) if: m∠r =x+28°, m∠s = 2x+16°, and m∠t = x+12

Use the elimination method to solve the systems of equations. choose the correct ordered pair. 7x+4y=39

The constitution gives congress the power to create federal courts lower than the supreme court higher than the supreme court equal to the supreme court, unaffected by the supreme court.