Suppose you are an elementary school teacher. you want to order a rectangular bulletin board to mount on a classroom wall that has an area of 90 square feet. suppose fire code requirements allow for no more than 30% of a classroom wall to be covered by a bulletin board. if the length of the board is three times as long as the width, what are the dimensions of the largest bulletin board that meets fire code?

3 feet wide and 9 feet long.

Step-by-step explanation:

The classroom wall has an area of .

The fire code requirements allow a bulletin board with an area of at most 30% of . This means that the maximum area of the bulletin board is

Let L and W be the length and wide of the bulletin board.  

If the length of the board is three times as long as the width, then L=3W, and the area of the board is

For the largest board we have,

So, the largest bulletin board that meets the fire code is 3 ft. wide and 9 ft. long.

your answer is the frist one

hop i