03- para ladrilhar totalmente uma parede de 27m por 2de área foram usadas peças quadradas de 15 cm de lado. Quantas pecas foram usadas ?
04- uma metalúrgica utiliza chapas de aço quadradas de 1m de lado para recortar 30 cm de lado . Ao sair da máquina, da chapa original sobre uma parte que é reaproveitada posteriormente. Quantos cm2 de chapa são reaproveitados?

The base of a triangle exceeds the height by 9 inches. if the area is 180 square inches, find the length of the base and the height of the triangle.

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.

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?