What will we end up with when we substitute into the formula?

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

Which of these sequences is a geometric sequence a 1,2,4, 7, 11, 16, 22. b. 2.4.8.14.22.38 c.3.6.9. 15.18,21 d. 3,9,27,81,243,729,

What is the correlation coefficient between the variables? round to three decimal places. enter your answer in the box