AC is tangent to circle O at point C. What is the measure of angle O?

Aparallel system functions whenever at least one of its components works. consider a parallel system of n components, and suppose each component works independently with probability 0.5. find the conditional probability that component n works given that the system is working

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8