Which of the following sets of ordered pairs represents a function? a. {(-9,9), (-9,12), (-9,0), (12,-9)} b. {(0,-9), (14,-9), (0,9), (-9,14)} c. {(9,-9), (12,-9), (0,-9), (-9,12)} d. {(9,14), (9,4), (0,0), (11,16)}

D

Step-by-step explanation: 9,14 and 9,4 is equal

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles