Given the following perfect square trinomial, fill in the missing term. (do not type the variable in the blank.)

4x2 + + 49

Find the value of the cosine for angle a

Two lines parallel to the same plane are parallel to eachother

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%)