What is the exact value of cos(11pi/21)cos(pi/7)-sin(11pi/21)s in(pi/7)? a. -squr3/2
b. -1/2
c. 1/2
d. squr3/2

What is best way to getting answer for my exam is

Find the perimeter of the figure shown above. a. 18 yds c. 20 yds b. 10 yds d. 24 yds select the best answer from the choices provided

Write a description of each inequality. 1. -5a + 3 > 1 2. 27 - 2b < -6 (this < has a _ under it) 3. 1/2 (c + 1) > 5 (this > has a _ under it)