Find s15 for the series -1 + -3 + -5 + -7 +
i am unsure of the formula to answer this equation. could someone give me a quick refresher. i do not want the answer, just the information necessary to find the answer myself. you!

Which expressions are equivalent to -6 + 3m

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20

Is the response to the survey question "did you smoke in the last week question mark "response to the survey question "did you smoke in the last week? " a discrete random variable, a continuous random variable, or not a random variable?