The exact value of cos 5pi/12 is:

A) 0.99
B) 0.26
C) sqrt2(sqrt3-1)/4
D) sqrt2(sqrt3+1)/4

Rationalize the denominator- 12x/√x-10

What is the distance between a and b? round your answer to the nearest tenth. a coordinate plane is shown. point a is located at negative 1, 5, and point b is located at 4, 1. a line segment connects the two points.

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%)