Consider a closed rectangular box with a square base, as shown in the figure. Assume x is measured with an error of at most dx 0.4% and y is measured with an error of at most 0.25%, so we have Idyl $0.004 and X y 5 0.0025. y X lavl a. Use a differential to estimate the relative error V in computing the box's volume V. as b. Use a differential to estimate the relative error S in computing the box's surface area S. lav) a. (Type an integer or a decimal. Round to two decimal places as needed.) as b. S (Type an integer or a decimal. Round to two decimal places as needed.)