Hi Dear tutor I just want the final answers. thank you,

\fLet R be the rectangle consisting of all points (xy) such that 0 s x s 4, O s y S 2. Calculate the following double integral and interpret the result as a volume. J'J'e 3'\"de dy R The volume is (Type an exact answer.) Find the volume under the given surface 2 = for, y) and above the rectangie with the given boundaries. z=2x+5y+7; 4sx32, 35y54 What is the volume of the region? units3 \fThe intensity of the reaction to a certain drug, in appropriate units, is given by R(t) = te -0.at, where t is time (in hours) after the drug is administered. Find the average intensity during the eleventh hour. The average intensity is units. (Round to three decimal places as needed.)