If the average (arithmetic mean) of 10,20,30,40, and x is 60, what is the value of x

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.

True or false? a triangle can be circumscribed about a given circle

You deposit $5000 each year into an account earning 3% interest compounded annually. how much will you have in the account in 30 years?