Please help me answer #8:

"Describe the graph of the Celcius-Fahrenheit relationship."

I'm not sure how to do this.

The ratio pv to nrt is plotted against pressure for ch4 at 0°c and 200°c. why does the curve for 0°c drop below the horizontal line for an ideal gas whereas the curve for 200°c does not?

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?