One third multiplied by “x” equals one but what does “x” equal?

Given f(x) = 10x + 4 and g(x) = 3x - 8, what is f(x) + g(x) ? - 7x - 4 - 13x + 4 - 7x + 4 - 13x - 4

Which of the following is an example of conditional probability

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)