What is the center of the circle with the equation x2 + y2 +4x-8y+11 = 0 ?

c

Step-by-step explanation:

(-2,4)

Step-by-step explanation:

You do this by completing the square for x and y.

x^2 + 4x + (4/2)^2 +y^2 - 8x + (-8/2)^2 = - 11 + 4 + 16

(x + 2)^2 + (y - 4)^2 = 9

The center should be (-2,4)

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

i need a picture

step-by-step explanation: