For this case we have that by definition, the volume of a rectangular prism is given by:

Where:
It is the area of the base
h: It's the height
According to the data we have:


Then:

Thus, the volume is:

Answer:

Ok to find dy/dx of x+2y=xy we take derivative of both sides with respect to x
1+2dy/dx = x*dy/dx +y*dx/dx
1+ 2dy/dx = x*dy/dx + y* 1
2dy/dx +1 = x*dy/dx + y
2y’ + 1 = xy’ + y
2y’ + 1 - xy’ = y
2y’ -xy’ = y - 1
y’(2-x) = y - 1
so we get finally
y’= (y-1)/(2-x)
Hope this helps you understand the concept! Any questions please ask! Thank you so much!!
Cos(35) = x/6
or 6 * cos(35) = x