Perey has 81 red balls, which she wants to arrange in rows. If the number of balls in each row must be equal to the number of two rows, how many balls must there be in a row?

What age of people are most affected by bipolar disorder

"follow hollywood's hottest diet craze to use more calories and feel great" this article most likely a) provides an easy-to-follow nutrition plan b) includes recommendations that are unsafe c) gives expert advice on creating a healthy lifestyle d) sets a realistic goal for health and weight loss

Which analyst position analyzes information using mathematical models to business managers make decisions?