David has $425 worth of items in his shopping cart. he receives a discount of 30% for the items at the checkout. if he then has to pay an 8% sales tax, what is the final amount that david paid?

An assembly consists of two mechanical components. suppose that the probabilities that the first and second components meet specifications are 0.87 and 0.84. assume that the components are independent. determine the probability mass function of the number of components in the assembly that meet specifications. x

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16