Fernando cleans pools for the summer for $25 an hour plus a supply fee of $15. Which equation models the cost for having Fernando clean a pool for x hours and how much will a 3-hour cleaning 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.

Which of the following represents the factorization of the trinomial below? x^2+7x-30

Afurniture store is having a weekend sale and is offering a 20% discount on patio chairs and tables the sales tax on furniture is 6.25%