A company makes a greenhouse that is shaped like a rectangular prism on bottom and a half cylinder on top.
The rectangular prism has a base that is 3 x 9 m and a
height of 2 m. What is the volume of this greenhouse?
Round to the nearest cubic méter.

Can some one explain this for me please

To find the extreme values of a function f(x. y) on a curve x-x(t), y y(t), treat f as a function of the single variable t and use the chain rule to find where df/dt is zero. in any other single-variable case, the extreme values of f are then found among the values at the critical points (points where df/dt is zero or fails to exist), and endpoints of the parameter domain. find the absolute maximum and minimum values of the following function on the given curves. use the parametric equations x=2cos t, y 2 sin t functions: curves: i) the semicircle x4,y20 i) the quarter circle x2+y-4, x20, y20 b, g(x, y)=xy

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

Determine if the equation defines y as a function of x: 2xy = 1. yes o no