Sin (a+b) = sin a cos b- cos a sin b for all values of a and b. true or false?

The height of a triangle is 4 in. greater than twice its base. the area of the triangle is no more than 168 in.^2. which inequalitycan be used to find the possible lengths, x, of the base of the triangle?

Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.