An airplane flying at an altitude of 12000 feet begins ascending at a rate of 900 per minute. At this rate, how many minutes will it take for the airplane to reach an altitude of 30,000 feet?

20 minutes

Step-by-step explanation:

30000= 900x+12000

18000=900x

20=x

c is the correct answer

step-by-step explanation:

c.

step-by-step explanation:

substitution for (0,1)

y=x^2+4x+1

1=0^2+4(x)0+1

1=0+4(x)0+1

1=4(x)0+1

1=0+1

1=1

substitution for (-3,-2)

y=x+1

-2=-3+1

-2=-2