True or False:
`28 in {y in N | the sum of the all positive factors of y is 2y}

Find the factors of y^2 –7y +12 .

Write True or False. Anabolism is the sum total of all constructive processes.

Find the value of a if 2y + 3 is a factor of 2y^3+9y^2-y-a .

True or false The line x=y=z lies in the plane x-2y+z-1=0.

True or false: y=asinx+bcosx , a in R , is the general solution of the differential equation (d^2y)/(dx^2)+y=0 .

True or False The more the solute molecules, the lower is Y_s .

True or false: x+ytan^-1y is a solution of the differential equation y^2(dy)/(dx)+y^2+1=0 .

True or false: y=x is a particular solution of the differntial equation (d^2y)/(dx^2)-x^2(dy)/(dx)+xy=x

The factor form of x^2-y^2/100 is :

Check whether the following statement is true or false by proving its contrapositive : “If x, y in Z , such that xy is odd, then both x and y are odd.”