-47, -18, -14, -9, 26, 34, 37
(r^10)-2 would be the expression
Check the picture below.
notice the red rise/run slopes, are the same, thus those two lines are parallel, and also notice the green one for the other two lines, meaning both pair of lilnes are parallel.
The answers 15.
Explanation: you can’t evenly divide the other option choices