Answer:
A = BH x 1/2
Like they said, use the formula to find the base.
We plug in our given values, to find the base out.
A = BH x 1/2
14 = B(7) x 1/2
14= b7 x 1/2
Divide by 1/2 from both sides(basically multiplying by 2/1)
*2/1 *2/1
28 = b7(let's reverse this to be);
28 = 7b
/7 /7
4 = b