Iwill give find the serface area of the cylinder in terms of pi. height = 12 in diameter = 6 in a. 216 (pi) in^2 b. 144 (pi) in^2 c. 432 (pi) in^2 d. 168 (pi) in^2

None of the given answers are correct.  To find the surface area you will find the areas of each circular base by using the formula for area of a circle.  

To find the area of the circular height, you will find the circumference of the circle and multiply by the height.

SA = 2(pi x r^2) + pi x d x h
        2 x pi x 3^2 + pi x 6 x 12
        18pi + 72pi
SA = 90pi.

The surface area would be 90 pi square inches.

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.

The answer to your question is 1/9