Answer:
:DDDDD
Step-by-step explanation:
9x^2 + 18x + 9 = 5
9(x^2 + 2x +1) - 5 = 0
x^2 + 2x - 4 = 0
Then use the quadratic formula.

Here we go ~
The air plane descends 15 feels every 1.45 seconds, so it's unit rate is :

Now we have to calculate the descent in 3.5 minutes ~


So, the airplane descends 2172.41 feels in three and a half minutes ~
It would be 6 and 1 cause:
6 × 1 = 6
6 + 1 = 7
Hope that helps :D