Part b: Continue to assume that the height of your cylinder is 8 inches. Write the radius r as a function of A . This is the inverse function to A(r) , i.e to turn A as a function of r into. r as a function of A .



r(A)=







Part c: If the surface area is 150 square inches, then what is the rardius r ? In other words, evaluate r(150) . Round your answer to 2 decimal places.

Hint: To compute a numeric square root such as 17.3−−−−√ , you could

Use a spreadsheet such as Microsoft Excel or OpenOffice Calc and type in =sqrt(17.3)
Use a browser to connect to the Internet and type in sqrt(17.3) into a search field
Use a calculator


The radius is
Number
inches if the surface area is 150 square inches.