Show all of your work. Simplify the expression: - 3a + 7 + 5a​

Which term best describes the association between variables a and b? no association a negative linear association a positive linear association a nonlinear association a scatterplot with an x axis labeled, variable a from zero to ten in increments of two and the y axis labeled, variable b from zero to one hundred forty in increments of twenty with fifteen points in a positive trend.

Use sigma notation to represent the following series for 9 terms.

What is the answer to the question 5x+2x