In circle o angle cod find the measure of arc bc

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

Which of the following quartic functions has x = –1 and x = –2 as its only two real zeroes?

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.