Find the area of the whole triangle . Show all work.

Can someone, me with this.i really need with this

As a self-employed seamstress, you know that it takes 7 yards of material to make 3 jackets. you bought 15 yards of material to make 7 jackets. did you buy enough material? if not, how much were you over or under?

Match each set of points with the quadratic function whose graph passes through those points