Solve the equation for y. then find the value of y for the given value of x.
7x-xy=-18; x=-4.

Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side

With both problems. a.s.a.p directions on photo ^

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)