Sarah's weekly salary increased from $240 to $288. What was the percent of change? Y’all please help I need a hundred

Gretchen is setting up for a banquet. she has 300 chairs and needs to distribute them evenly among t tables. how many chairs should she put at each table? write your answer as an expression.

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b