At sea level, the pressure is 1013, that's when the altitude is at 0, sea level, let's see

so, the inital amount is 1013, when t = 0,

now, to check the atmospheric pressure at 4000, simply set t = 4000, to get A.
Answer:
540
Step-by-step explanation:
259 + 279 = 538
Rounded to nearest 10
= 540
First, multiply 5 and 8. That equals 40. Then you take the square root of 40, which doesn't result in a whole number, so you factor 40 and removing perfect squares. In which case the answer would be 2√10
Answer:
3x + 100 < 2x - 250
Step-by-step explanation:
The problem said that Keisha's guess was "250 less than twice the number".
It was written as 250-2x, which is actually twice the number less than 250, because we are subtracting 2x. We just need to write it like this:
2x-250
So the inequality should be:
3x + 100 < 2x - 250