Help me please help me i have exam :(

#1-20 state whether the angles are alternate interior, alternate exterior, vertical, or corresponding angles.

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

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.