Does anyone know the answer to this?

Hey there!

First, let's find s:

s = (5 + 6 + 7) /2 = 9

Second, let's plug in the numbers into the formula:

A =

Third, let's simplify the numbers to get one number under the square root:

A = [tex]\sqrt{216}

Fourth, we'll find the square root of 216 to get the area:

A = 14.697

Therefore, your answer is A.

Hope this helps!! :)

step-by-step explanation:

a and d