It's asking to solve for a1 but I don't really know how, please help.

If δmtv is reflected across the y-axis, what are the resulting coordinates of point m? a) (-2, 5) b) (-5, 2) c) (5, -2) d) (-2, -5)

In the 30-60-90 triangle below side s has a length of and side r has a length

Rationalize the denominator- 12x/√x-10