Can yall help me with this question?

How can you find the mean absolute deviation (mad) for this set of data?

If f(x) = -5x + 1 and g(x) = x3, what is (gºf)(0)? enter the correct answer

Judy garland electronics operate on a net-profile rate of 20% on its printer cables. if the markup is $8.95 and the overhead is $4.31,find the net profit and the selling price? use the net-profit rate formula to solve this problem.