For her birthday party shanice mixed together 2 liters of brand a fruit punch and 4 liters of apple juice. if brand a contains 25% fruit juice, then what percentage of the final mixture is the fruit juice?

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.

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"

Change negative exponents to positive. then solve. round to four decimal places