You have just calculated the z-score for the online course. at the end of the year, the department wants to know if the online class (the sample) was significantly different from the in-person class (the population) using a two-tailed test and an alpha-level of .05, is performance in the online course significantly different from the population mean? (answer and provide at least 1 sentence explanation).

David must install fencing around a lot that is shaped like a right angle.the side of lot that runs east-west is 200 ft long.the side of the lot runs north-south is 125 ft long.calculate how many feet of fencing he will need to surround the entire lot.

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

How do you write something in scientific notation?