Norman bought 16-pound bag of charcoal for $7.89 and a 10.4-pound bag for 5.69.Whats is the total weight of the two bags of charcoal?

Use the x-intercept method to find all real solutions of the equation. -9x^3-7x^2-96x+36=3x^3+x^2-3x+8

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

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.