Anurse needs to mix some alcohol solutions, given as a percent by weight of alcohol in water. thus in a 3% solution, 3% of the weight would be alcohol. she mixes x grams of 3% solution, y grams of 10% solution, and 10 grams of pure water to get a total of 140 grams of a solution which is 8% alcohol:

the total grams equations is: x+y+10=140
the total grams of alcohol equation is: .03x+.1y=11.2
11.2= 140*.08

the question asks:
how many grams of each solution are
needed?

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.

Justin has 750 more than eva and eva has 12 less than justin together they have a total of 63 how much money did

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]