Three times the sum of five times a number and two is equal to fiveteen times the number

Me, prove a quadrilateral with vertices g(1,-1), h(5,1), i(4,3) and j(0,1) is a rectangle using the parallelogram method and a rectangle method.

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

Recall that two angles are complementary if the sum of their measures is? 90°. find the measures of two complementary angles if one angle is twenty dash nine times the other angle.