According to the diagram above how long is the unknown piece

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

The total number of dental clinics total for the last 12 months was recorded

Solve the equation: x - 9 = -6 + 5 a. 21 b. 7 c. 14 d. 2