Alyssa emptied out her change jar to buy a new binder for school. she found 147 coins consisting of dimes and nickels that totaled 11.65. write a system of equations that could be used to determine how many dimes, d, and how many nickels, n, alyssa had in her change jar.

Standard deviation of 19,29,21,22,23

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.

What is the solution to the equation below? 3/x-2+6=square root x-2 +8