Write two addends that will not need to make a 10 to add. Then solve

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

The price of a visit to the dentist is \$50$50. if the dentist fills any cavities, an additional charge of \$100$100 per cavity gets added to the bill. if the dentist finds nn cavities, what will the cost of the visit be?

The graph of a quadratic function has a maximum at point (0, 5). the graph contains the point (2, 1). what is another point on the graph?