Gh0sty15

I always do. Except for Mondays. And Tuesdays. Probably Wednesdays. And maybe Thursdays. Fridays are...eh. 

Oh...that was the same person? I can see why that was a bit rude... 

Maybe there should be a rule where guests can't edit answers? (Just suggesting. Please don't take offense)

And he did say thank you...

Me neither.

So I guess time is in minutes.

The question says: How many minutes after liftoff is the plane at an altitude of 21,000 feet?

So... in the equation a=3400t+600, we plug in 21,000 for a. Because we have to find 't' when 'a' is 21,000.

That gives us 21,000 = 3400t+600.

Subtract 600 to both sides to get 20,400 = 3400t

Divide both sides by 3,400 and you get 6 = t.

So it takes 6 minutes for the plane to be at an altitude of 21,000.

6 minutes.

We know that we have to do the multiplication first, for there are no brackets.

So in 9-8+9*9, we do the 9*9 first, which is 81.

That gives us 9-8+81

Simplify to get 82.

82 is the answer.

x > 0? 

Because the denominator should not be 0, or else there wouldn't be any real solutions.

Correct me if I'm wrong.

(My brain is a bit fuzzy these days. I haven't answered a math question for a while...)

It's probably 9. Probably. It might be 1. But let's just go with 9. 

Just do as much as you can to go to college and live a happy life.

-quote from Ghosty.