I need help please, I forgot how to do these questions:(

What is the product? a-3/15a × 5/a-3

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

The median for the given set of six ordered data values is 29.5 9 12 25 __ 41 48 what is the missing value?