Alex needs to varnish the top and the bottom of a dozen rectangular wooden planks. the planks are 8 feet long and 3 feet wide. each pint of varnish covers about 125 square feet and costs $3.50. a: what is the total area that alex needs to varnish? b: how much will it cost alex to varnish all the wooden planks?

The edge of a cube was found to be 30 cm with a possible error in measurement of 0.4 cm. use differentials to estimate the maximum possible error, relative error, and percentage error in computing the volume of the cube and the surface area of the cube. (round your answers to four decimal places.) (a) the volume of the cube maximum possible error cm3 relative error percentage error % (b) the surface area of the cube maximum possible error cm2 relative error percentage error %