Franco spent $ 12.10 from his collection dimes and

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?