6. darnelle has a $10,000, 3-year loan with an apr of 5%. she uses the table on
page 159 to compute information on the loan.
a. what is her monthly payment?
b. what is the total of all her monthly payments?
c. what is the finance charge?

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.