What addition expression is equivalent to (–5) – 8?

Students are given 3 minutes for each multiple-choice question and 5 minutes for each free-response question on a test. there are 15 questions on the test, and students are given 51 minutes to take it.how many multiple-choice questions are on the test?

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

The square root of 9x plus 7 plus the square rot of 2x equall to 7