8.149 The differential equation y' = x² y² - 92² (a) is a linear equation (b) equation has no constant solutions (c) is an equation with seperable variables.

A math teacher asks each student to create a password to gain access to her website. The password has 5 digits. She makes up some rules for the students to follow in their password selection. The first digit must be a multiple of 1. The second digit must be a multiple of 2. The third digit must be a multiple of 3, and so on. How many possible passwords are there?

A farmer is raising chickens and cows. There are 42 total chickens and cows on his farm, in which there are a total of 140 legs. Assuming that all the chickens have 2 legs and all the cows have 4 legs, how many cows are on the farm?

A realtor uses a lockbox to store the keys to a house that is for sale. The access code for the lock box consists of four digits. The first digit cannot be zero and the last digit must be off. How many different codes are available