The answer is
5mn(KUASA DUA) -6gh(KUASA DUA) +2
There would be 2034 students competing in 2012.
We can write a simple equation to find this answer. Let X, be the number of students starting in 2012. Then, we multiply by 0.9 and 1.1 to get to 2014. To work backwards, just divide by 1.1, then by 0.9.
2014 / 1.1 / 0.9 = 2034
The slope is 1/7. The formula for slope is: m=y2-y1/x2-x1
Easy 7x3 is first then 7x4 then 7x5=7x_
