IF f(x)=ax^6 + bx^5 + cx^4 + dx^3 + ex^2 + fx + g

f(1)=1

f(2)=2

f(3)=3

f(4)=4

f(5)=5

f(6)=6

f(7)=?

the diameter of a roller is 84 cm and its length is 120 cm. it takes 500 complete revolution to  move once over to level a playground. find the area of the playground in square m?

Find dy/DX when y=x^sinx+sin-1√x.

 

Please give me the solution of this problem. 

Solve the differential equation y’’+2ty’-4y=1, y(0)=y’(0)=0.