Answer:
(1/2)(6)(a) < 18
Step-by-step explanation:
We know the formula for the area of a triangle is 1/2 b x h
The base is 6in and the height is a, so the equation is 1/2 6 x a.
The area is less than 18 sq in, so 1/2 x 6 x a < 18
Now, let's solve the inequality.
1/2 6 x a < 18
3 x a < 18
a < 6
Hope this helps :)
