FIND THE VOLUME OF THE CYLINDER

Step-by-step explanation:

Given

diameter(d) = 10 ft

radius(r) = d / 2

             = 10 / 2

             = 5 ft

height(h) = 11 ft

Now

Volume of cylinder

=

=

=275 ft^3

Or you can  add the value of pie

= 275 * 3.14

=863.5 ft^3

Let x represent the # of 2-hour days and y the # of 3-hour days.  Jimmy's study was spread over 10 days.  Thus, x + y must sum up to 10.  Also, 2x + 3y must sum up to 22 hours.

Our system now looks like this:

   x  +  y  = 10
 2x  +  3y = 22

Multiply the first equation by -2:  -2x - 2y = -20

Add the 2nd equation to this:

-2x - 2y = -20
2x  + 3y = 22

        y = 2       So Jimmy had 2 3-hour study days and 8 2-hour study days.

Note how these figures add up to 22:  6 + 16 = 22