A customer owes $10.51 and pays $50 in cash. Provide the amount owed using the smallest number of bills and coins possible

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

Solve the system of equations. y= 2x y= x^2 - 15

Triangle xyz has vertices x(1,3), y(0,0)