PLEASE HELP ASAP WILL MARK THE BRAINLEST DUE TODAY NEED YA'LL HELP
Question 1) Which gas is the most abundant in Earth’s atmosphere?

A) methane

B) carbon dioxide

C) oxygen

D) nitrogen

Question 2) Particles of air escape into space from which layer of the
atmosphere?

A) troposphere

B) mesosphere

C) thermosphere

D) stratosphere

Question 3) Which atmospheric layer is most dense?

A) stratosphere

B) mesosphere

C) troposphere

D) thermosphere


Question 4) Where do meteorites burn up?

A) stratosphere

B) thermosphere

C) mesosphere

D) troposphere


Question 5) Which layer of the atmosphere is the least dense?

A) troposphere

B) exosphere

C) stratosphere

D) mesosphere

Asmall (but heavy) particle placed in a glass of water will follow a zigzag motion because the particle will bounce off of the water molecules it meets. this is called brownian motion. a physicist simulates this on a computer, by varying the distance a particle can travel (called the mean free length), on average, before it collides with a water molecule and assigning the change in motion to be one of 8 directions, each with a similar probability. by running the simulated particle (with the same mean free length) many times she determines that it should take 15 seconds, on average, for the particle to fall to the bottom, with a standard deviation of 1.5 seconds. next she lets a real particle fall through a glass of water and finds that it took 18 seconds. what does she conclude, and why?

1foot = 12 inches; 1 yard = 3 feet

Erinn wrote the equation –5x + 4y = 32 to represent her hourly wage (y) and how this wage has changed during each year that she worked at a company (x). what is the rate of change in erinn's hourly wage per year?