Simplify each sum or difference. state any restrictions on the variables.
19) (-3x)/(x^2 - 9) + 4/(2x-6)

At school there are 526 students and 263 are girls about how likely is it that a randomly chosen student will be a boy

Does the problem involve permutations or? combinations? do not solve. the matching section of an exam has 4 questions and 7 possible answers. in how many different ways can a student answer the 4 ? questions, if none of the answer choices can be? repeated?

Which number line represents the solution set for the inequality -1/2x> 24?