What expression would give the number of ways to choose a group of 7 from a group of 15?

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

Multiply and simplify. (x - 4) (x^2 – 5x – 6) i will mark brainliest if your answer is right. show how you got the answer. if your answer is correct but does not show how you got the answer you will not be marked brainliest.

Explain how to convert measurements in the metric system