Solve the problem.
make sure your answer is in simplest form.

5/8 x 4/15=?

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

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

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