The base of an isosceles triangle is 7 cm longer than the legs. find the legs if the perimeter of the triangle is 43 cm.

(20 points and free brainiest )

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%)