Solve the equation for f

f(9) = ±2

Step-by-step explanation:

f(x) = sqrt(x+7)

          2

Let x = 9

f(9) = sqrt(9+7)

          2

f(9) = sqrt(16)

          2

f(9) = ±4

         2

f(9) = ±2

c. (3,2,6) is the answer.

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