Simplify the expression by combining like terms -4f-9-f+15​

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

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

What is the value of x in the equation7x+2y=48 when y=3