The posted speed limit is 55 MPH. If you’re driving 1000 feet per minute, are you going too fast? Why is the appropriate choice of unit important? Give an example of a measurement you could take, and an inappropriate unit of measurement for that task. Explain why this unit is inappropriate and choose a unit of measurement which would be better.

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

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9

20 ! brainliest ! add and simplify your answer.