For questions 4-7 find the measures of the angles in the picture below

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

Jermaine has t subway tokens. karen has 4 more subway tokens than jermaine. raul has 5 fewer subway tokens than jermaine. which expression represents the ratio of karen's tokens to raul's tokens

Acircle has a circumference of 7.850 units. what is its radius?