The ratio of blue shirts to red shirts in Mr. Wilson's closet is 5:2. He knows he has 21 blue and red shirts combined. How many blue shirts are in Mr. Wilson's closet?

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

Liz is shipping a package to her friend. the maximum weight of a medium flat-rate box is 20 pounds, including the box which weighs 6 ounces. write and solve an inequality to describe the possible weight in pounds, w, of the contents that liz will ship to her friend if she must use a medium flat-rate box. use the drop-down menus to explain your answer.

Find the solution on the interval [0, 2pi)