Adding and Subtracting Rational Numbers

 $Find\ the\ sum\ of\ \frac{2}{3}\ +\ \left(-\frac{1}{3}\right).$  

(a)  

 $Is\ -\frac{1}{3}\ -\ \frac{4}{5}\ positive,\ negative,\ or\ zero?$  

Find the value of the expression (-8.6) + 7.2.

(a)  

  $Is\ \frac{2}{5}\ -\ \left(-\frac{5}{6}\right)\ positive,\ negative,\ or\ zero?$  

 $Use\ the\ \exp ression\ \ -\frac{1}{3}\ -\ \left(-\frac{5}{12}\right).$  

 $Find\ the\ value\ of\ the\exp ression\ -\frac{1}{3}-\ \left(-\frac{5}{12}\right).$  

The temperature one morning was $-4.7\degree F\ and\ rose\ to\ 11.6\degree F.\ \$  

Find the difference in the temperatures.

(a)  

The bottom of the pylon is $3\ \frac{1}{2}$  yards below the ground.  The top of the pylon is  $2\ \frac{1}{2}$  yards above the ground.  How tall is the pylon?

Manuel climbs a tower from ground level to an elevation of  $135\ \frac{1}{2}$  feet.  He then climbs down  $27\ \frac{1}{4}$  feet.  How far is Manuel from the ground? 

What answer did Sam get when she simplified the expression 3.5 - (-4.1)?