Write a story for 3/9=21/k

David contributes 3 dollar for every 9 dollars that Ken contributes, how dollars will Ken contribute when David contributed 21 dollars.

Step-by-step explanation:

David and Ken are contributing money to buy a textbook.

They agreed, that every 3 dollars that David contributes, Ken should contribute 9 dollars.

Find how much Ken contributed if David when David contribute 21 dollars.

If we set up a proportion equation to solve this problem, we get;

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so a parallelogram is just like a square base times height. multiply 40 and 39 to get 1560 inches.

a triangle is base times height divided by two. so multiply 7.9 and 5 and then divide it by 2 to get 19.75inches.

the kite can be split into two separate triangles and added together to get the total area. 30 x 4 /2 which equals 60. make sure to double it for the two triangles making 120.