What does the shaded side of the multiplication table mean.

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b

When is g(x) = 0 for the function g(x) = 5.23x + 4?

The perimeter of a quarter circle is 14.28 miles. what is the quarter circle's radius?