It would be 4 and 5 since those are two angles whose measures have a sum of 180.
A large MAD (mean absolute deviation) tells us that there is a lot of variation in the ages of the swimmers. It tells us specifically that there are a lot of swimmers that are not close the to the age of 10 (which is the mean).
You have an equation with to variables.
What question are you being asked?
<span>y - 4 = -2/3(x - 9)
3y - 12 = -2x + 18
3y = -2x + 30
y = -2/3 x + 10 <------ slope-intercept form
</span>
That angle is
C. Right
Because it is 90 degrees.