The residual plot for a data set is shown. based on the residual plot, which statement best explains whether the regression line is a good model for the data set and why? a. the regression line is not a good model because some residuals are negative. b. the regression line is a good model because the points in the residual plot are close to the x-axis. c. the regression line is a good model because there is a pattern in the residuals. d. the regression line is not a good model because the points in the residual plot form a curve.

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

Due to bad planning, two of the local schools have their annual plays on the same weekend. while 457 people attend one, and 372 attend the other, only 104 people were able to attend both. how many people went to at least one play?

What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83