Simplify. 4x+8/x^2+9x+20 + x+12/x^2+9x+20 A) 1/x+1 B) 5x/x+5 C) 5/x+4 D) 5/x+5

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

Anyone know? is appreciated! will mark brainliest if correct!

What is the difference between the points (4, 7) and (4, -5)? a. 0 units b. 2 units c. 4 units d. 12 units