Simplify using only positive exponents 8 to negative 2 power times a to the 7 power

Alex drew a circle with right triangle prq inscribed in it, as shown below: the figure shows a circle with points p, q, and r on it forming an inscribed triangle. side pq is a chord through the center and angle r is a right angle. arc qr measures 80 degrees.

Simplify the following expression 48^1/2

Find the slope of the line that passes through the points (-2, 4) and (-5, -6). -2/7 10/3 -2/3