Caracterisitcas y aplicacion numeros pentagonales

The vertices of a triangle are a(7,5), b(4,2), c(9,2). what is m

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.

If the value of x increases by 5, how does the value of m(x + 3) change? a) it increases by 5m. b) it increases by 8m. c) it decreases by 5m. d) it decreases by 8m.