2 2/3 x 1/2 ayuda por favor​

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

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.

What percent of 18 is 24? and plz explain thx.