The measure of the largest angle of a triangle is 30° less than the sum of the measures of the other two angles and 9° less than two times the measure of the smallest angle. Find the largest angle.

The diagonals of a quadrilaretral intersect at (-1,4). one of the sides of the quadrilateral is bounded by (2,7) and (-3,5) determine the coordinates of the other side in order for the quadrilaretral to be a square.

Can someone me out here number 4 plz

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0