What are the roots of the equation x 2-10x+21=0

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*

The tile along the edge of a triangular community pool needs to be replaced? ?

In a certain city, the hourly wage of workers on temporary employment contracts is normally distributed. the mean is $15 and the standard deviation is $3. what percentage of temporary workers earn less than $12 per hour? a. 6% b. 16% c. 26% d. 36%