Unit 5 Lesson 12: Negative Rates

If sea level is represented by 0 feet, would a submarine descending be a positive or negative number?

• positive

• negative

If sea level is represented by 0 feet, would a dolphin jumping out of the water be represented by a positive or negative number?

• positive

• negative

Kevin's descent into a cave is represented by -12 feet per minute. We can use the relationship y = -12x to model this where y is the depth in feet and x is the time in minutes. If the cave was -48 feet deep, how long would it take Kevin to reach the bottom?

• 12 minutes

• 4 minutes

• 6 minutes

• 8 minutes

Kevin descended to 48 feet in the cave. It took him 24 minutes to ascend back to sea level. How many feet per minute did it take him?

• 12 feet per minute

• 3 feet per minute

• 2 feet per minute

• 4 feet per minute

 $-4\times-6\ =$  

•  $-2$  

•  $2$  

•  $-24$  

•  $24$  

Is the quotient positive or negative?

 $12\div\left(-6\right)=$  

• positive

• negative

 $-8\div\frac{1}{2}=$  

•  $-4$  

•  $4$  

•  $-16$  

•  $16$  

 $-\frac{5}{3}\div\frac{1}{6}=$  

•  $-10$  

•  $10$  

•  $\frac{5}{18}$  

•  $-\frac{5}{18}$  

 $-15\div0.3=$  

•  $5$  

•  $-5$  

•  $50$  

•  $-50$  

Is the product positive or negative?

 $-\frac{2}{5}\times\left(-\frac{1}{3}\right)=$  

•  $-\frac{2}{15}$  

•  $\frac{2}{15}$  

•  $\frac{6}{5}$  

•  $-\frac{6}{5}$