The answer is most likely B. :)
I used mental math and it took a long time, but I got the answer of 2,499.
The answer is 19.6 cm^2
you should find the height of the triangle by heron formula: it will be 9.8
so the area is
good luck
Answer: -2*(9n-4)/9
Step-by-step explanation: The -2*(9n-4) is over the 9