Why are you so u g l y

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

Find the maximum value of p= 4x + 5y subject to the following constraints :

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