I think you add the exponents im not sure haven't done it in long time
Answer:

Step-by-step explanation:
we know that
In the right triangle QRS
----> by SOH (opposite side divided by the hypotenuse)
substitute the given values

solve for SQ

Step-by-step explanation:
We need to understand what residual plot is?
A residual plot is a graph that shows the residuals on the vertical axis and the independent variable on the horizontal axis.
Hence, there are 2 cases related to the relation between residual plot and a linear model:
1. If the points in a residual plot are randomly dispersed around the horizontal axis => the linear model is an appropriate fit for the data
2. If the points in a residual plot has a pattern => nonlinear model is more appropriate or the line have a bad fit with the set of the data.
Hope it will find you well.
Try using the equation v= pi(r)^2