Jayla drove 7 5/12 kilometers to the post office and 8 1/24 kilometers to a restaurant. Which of the following expressions can be used to determine the total number of kilometers that Jayla drove?

Use the matrix-column representation of the product to write each column of ab as a linear combination of the columns of a.

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68

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.