The radius of a semicircle is 4 millimeters. What is the semicircle's diameter?

Part a : solve -vp + 40 < 65 for v part b : solve 7w - 3r = 15 for r show your work .

2x + 1 < 5 solve the following inequality. then place the correct number in the box provided.

Which sum or difference identity would you use to verify that cos (180° - ∅) = -cos ∅? a. sin (α -β) = sin α cos β – cos α sin β b. cos (α -β) = cos α cos β – sin α sin β c. cos (α -β) = cos α cos β + sin α sin β d. sin (α + β) = sin α cos β + cos α sin β