The options for the above attached question is

A) 1

B) 2

C) -1

D) none

I got the answer to be 1 but the answer is given to be none. Did I make a mistake or is the answer key wrong?

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.