Which phrase describes an unknown or changeable quantity

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.

What is the order of these fractions from least to greatest 2/3 7/10 5/8 65/100

Find the percent error of the measurement 4 cm