*keep in mind that area of a triangle is: A= b*h/2
we know that the area is 15 inches, and the height is 5 inches
A=15
H=5
15 doubled is 30, so we know that before we divided is, it was 30
so - 5*___=30 - to figure this out we need to do the opposite of multiplying, which is dividing
so - 30/5=6
the base is 6, to check our answer, we do this:
H=5 b*h/2
B=6
b*h/2 = 5*6/2=15
i hope this helped!!