Perform the indicated operation. Express your answer in simplest form. Show any necessary work. Then answer the question.
-2.48
a) (2 pts)
8
- 12.5
b) (2 pts)
0.25
c) (4 pts) Kevin believes that *** =
= -12.5. Jack believes that = 12.5. Using a complete sentence,
explain who has the correct answer and why

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.

Which of the following contains a variable?

Rectangle bcde is similar to rectangle vwxy. what is the length of side vy? a) 1 7 b) 2 7 c) 3 7 d) 4 7