Triangle LMN with vertices L(6, 6), M(8,8), and N(8,3): a) reflection in the line x = 5
b) 270° counterclockwise rotation about the origin

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

Annabelle's homework is 75% it took her three hours how long should she estimate it will take her to complete her homework.

∠a and ∠ b are complementary. if m∠ b = 80°, what is the measure of ∠ a? 10° 80° 90° 100°