Use a half-angle identity to find the exact value of tan 105º.
a. -√7 +4√3
c. √7+4√3
b. -√7-4√3
√7-43
d.

The triangles are similar. what is the value of x? show your work.

Suppose sat writing scores are normally distributed with a mean of 497 and a standard deviation of 109. a university plans to award scholarships to students whose scores are in the top 2%. what is the minimum score required for the scholarship? round your answer to the nearest whole number, if necessary.

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5