(-5x2 - 3x - 7) + (-2x3 + 6x2 - 8) simplify a) -7x3 + x2 - 3x - 15 b) -2x3 - 3x - 15 c) -2x3 + x2 - 3x - 15 d) -2x3 + x2 - 3x - 1

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

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).