Operations with Rational Numbers

The elevators in the Empire State Building descend at a rate of about 7 meters per second. Find the change in altitude of an elevator that descends for 13 seconds.

REMEMBER: 

distance $=rate\cdot time$  

• 20m

• 91m

• -20m

• -91m

Find the change in height per second of a skydiver who falls 648 meters in 12 seconds.

REMEMBER: 
distance  $=rate\cdot time$  

• 636 meters per second

• -636 meters per second

• 54 meters per second

• -54 meters per second

Evaluate the expression:

 $-3+\left(6-9\right)\cdot\left(-4\right)$  

• 9

• 24

• -24

• -10

Evaluate the expression:

 $\left(-35-5\right)\div8-17$  

• -12

•  $\frac{40}{9}$  

•  $\frac{30}{9}$  

• -22

Calculate the area of the figure.

• 24 in²

• 74 in²

• 84 in²

• 122 in²

A shopkeeper paid $80 for 80 bagels. He sold half of them at $2 each and the rest at $1 each. What is his profit?

REMEMBER: Profit is what is left after you spend money for your business.

• $120

• $80

• $40

• $20

Evaluate the expression:
 $\frac{1}{4}+\left(\frac{-5}{12}\right)+\left(\frac{-2}{3}\right)$  

•  $\frac{-6}{19}$  

•  $\frac{-5}{6}$  

•  $\frac{1}{2}$  

•  $\frac{5}{6}$  

Evaluate the expression:
 $\left(-1\ \frac{1}{3}\right)+\left(2\ \frac{5}{6}\right)$   

•  $\frac{3}{2}$  

•  $\frac{22}{9}$  

•  $-1\ \frac{3}{2}$  

•  $\frac{5}{6}$  

Evaluate the expression:
 $\frac{1}{3}+\left(\frac{-5}{6}\right)+\left(\frac{-3}{4}\right)$  

•  $\frac{3}{4}$  

•  $\frac{-7}{13}$  

•  $\frac{-5}{4}$  

•  $\frac{9}{13}$  

Evaluate the expression:
 $\frac{1}{5}-\frac{2}{15}$  

•  $-\frac{1}{10}$  

•  $\frac{1}{15}$  

•  $\frac{3}{20}$  

•  $-\frac{1}{20}$