Certain gases in the atmosphere trap heat on earth.

what is the name of this phenomenon?

a.
the greenhouse effect

b.
global warming

c.
glacial melting

d.
cooling period

this is science not mathematics

I’m confused on how to work the pie charts

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?

What is the solution to the system of equations? y=1.5-3 y=-x