What multiplies to -1 and adds up to 0?

Radii ok and nl are perpendicular to om because of the radius-tangent theorem. by definition of perpendicular, angles kom and lnm are right angles. this means that triangles kom and lnm are right triangles. angle lmn is common to both right triangles, so by the triangles kom and lnm are similar.

Find the average rate of change for f(x) = x2 − 3x − 10 from x = −5 to x = 10.

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?