What is the area of the base (B) of the figure below? 20 square feet

40 square feet

100 square feet

674 square feet

The ratio pv to nrt is plotted against pressure for ch4 at 0°c and 200°c. why does the curve for 0°c drop below the horizontal line for an ideal gas whereas the curve for 200°c does not?

One integer is 8 times another. if the product is 72, then find the integers

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.