Observe the rules for significant digits and precision when answering questions 27 and 28.

Add 1.4 + 7.13.  ____________ 

Multiply 7.413 ´ 1.4.  ____________ 

 

 

27. Compute the volume of liquid in a barrel that has a height of 8.5 feet and a diameter of 5.8 feet. Use the formula V = πr²h where r is the radius of the barrel and h is the height of the barrel.  ____________  

28. The wages you earn vary directly with the number of hours you work. Suppose you earn $450 for working 30 hours. At that rate, how many hours would you need to work to earn $330?  ____________