In July, the average temperature in one US city was 29 degrees celsius. By December, the average temperature had fallen by 29 degrees celsius. Explain why the average temperature in December was 0 degrees celsius ?

Which graph represents an even function?

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

Astudy was interested in determining if eating milk chocolate lowered someone's cholesterol levels.ten people's cholesterol was measured. then, each of these individuals were told to eat 100g of milk chocolate every day and to eat as they normally did. after two weeks, their cholesterol levels were measured again. is there evidence to support that their cholesterol levels went down? how should we write the alternative hypothesis? (mud = the population mean difference= before - after)a. ha: mud = 0b. ha: mud > 0c. ha: mud < 0d. ha: mud does not equal 0