1- Em uma família, três irmãos possuem as seguintes alturas: 1,55 m ; 1,70 m e 1,80 m. Determine: a) A média das alturas dos irmãos.

b) O desvio padrão da altura desses alunos.

Find the quotient. 50a2 – 98b2 -5a +7b

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

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?