Use the elimination method to solve the system of equations. Choose the correct ordered pair. 4x + 7y = 60
-4x + 7y = -4

Write the system of equations represented by the matrix. 0 1 2 4 -2 3 6 9 1 0 1 3

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?