Question 5 multiple choice worth 4 points)
(04.03) mark bought gifts for his friends, and each gift cost $9. let y represent the total cost and x represent the number of gifts. write an equation to represent the proportional relationship
between the total cost and the number of gifts he bought
y = 8x
y= 1/8 x
y = 9x
y=1/9x

Compare the subtraction problems 6/8 - 5/8 = 1/8 and 6/9 - 7/9 = 1/9 why is the answer to the first problem positive and the answer to the second problem negative

Explain why the factor 1.5 is broke. into two numbers in the model.

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.