5) Combine like terms for this expression: X+5x2 + 6 - 2 + 3x + 3x + 4

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

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?