This graph shows the relationship between x, the number of hours Ms Djakpa works, and y, the number of dollars she earns. Write an equation that could be used to find y, the number of dollars Ms. Djakpa warns for working x hours.

In which form is the following function written? y = - 2(x – 3)(x + 5)

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

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.