Check all the following expressions that are written in correct scientific notation. A 1.2 * 55 B 32.4 * 106 C 5.2 * 10-7 D 3.24 + 105 E .98 7 * 104 F 8.345601 * 104

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.

When george started his current job, his employer told him that at the end of the first year, he would receive two vacation days. after each year worked, his number of vacation days will double up to five work weeks (25days) of payed vacation. how many vacation days will he have in 4 years

In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog