y = 6
6y-(2y-5)=29
>distribute the invisible -1 in front of the paranthesis
6y-2y+5=29
>combine like terms & move 5 to the right side w/ 29
4y=24
>divide 4 by both sides to isolate 4
y = 6
You can check your answer by multiplying 3 with 4 <span>and then add 6 to the product. Then your result will be 18.</span>
Surface area of the base = 4^2 = 16 units^2.
Area of each triangular side = 1/2 * 4 * 3 = 6 unts^2
Total surface area of the pyramid = 16 + 4 * 6 = 40 unit^2 (answer)
