Why is 1/3 + 1/4= 7/12 not 2/7 ? explain why

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

The vertices of a triangle are a(7.5), b(4,2), and c19. 2). what is