Apiggy bank contains 100 coins consisting of nickels and dimes. the total value of the coins is $8.50. how many coins of each type does the bank contain?

What is the value of the expression below? (81^2)^1/8

If chord ab is congruent to chord cd, then what must be true about ef and eg?

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.