Idon’t even know where to begin on this one

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

Find the zeros of the function. write the smaller solution first, and the larger solution second f(x)= (x+6)^2-49

1. a right triangle is graphed on a coordinate plane. find the length of the hypotenuse. round your answer to the nearest tenth. 2. use the angle relationship in the figure below to solve for the value of x. assume that lines a and b are parallel and line c is a transversal.