Show me how to answer -2/7 divides by 10/7

7x+8y=-18, 4x-9y=-3 solve the system of equations

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

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct