Multiply
3y^2(-7y^6)
simplify your answer as much as possible.

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).