Let swn ! n, where for each n 2 n, s. n/ is the sum of the distinct natural number divisors of n. this is the sum of the divisors function that was introduced in preview activity 2 from section 6.1. is s an injection? is s a surjection? justify your conclusions.

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

Axel follows these steps to divide 40 by 9: start with 40. 1. divide by 9 and write down the remainder. 2. write a zero after the remainder. 3. repeat steps 1 and 2 until you have a remainder of zero. examine his work, and then complete the statements below.

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?