Cos 3pi/12 using half-angle identities can you explain how to do it.

Describe the symmetry of the figure. identify lines of symmetry, if any. find the angle and the order of any rotational symmetry.

Angel entered a triathlon (a three-part race). he swam 1 mile, rode his bike 30 miles, and ran 10 miles. how far did he go altogether? a. 11 miles b. 123 miles c. 41 miles d. 40 miles

If the dimensions of a rectangular prism are 5 ft x 3.5 ft x 2 ſt, what is the surface area?