Help please this has to be done

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

Apiling for a high-rise building is pushed by two bulldozers at exactly the same time. one bulldozer exerts a force of 1250 pounds in a westerly direction. the other bulldozer pushes the piling with a force of 2650 pounds in a northerly direction. what is the direction of the resulting force upon the piling, to the nearest degree? a. 65 n of w b. 25 n of w c. 45 n of w d. 35 n of w

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.