How to find the surface area of this

Perform the required operations on the following functions given: f(x)= 3-x; g(x)= -2x find g[f(x)]

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

Idon't want to fail summer school.the probabilities of contamination in medicine capsules due to the presence of heavy metals and different types of microbes are given in the table.the probability of capsule b having microbial contamination is (the same as, greater than, less than) the probability of capsule d having it.