Evaluate the expression if a = 2 and b = 1. 3 ( 5a + b ) aba. 15.5b. 16.5c. 10.5d. 22.5

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

When you answer this can you explain

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