Polly has a certain number of dollar bills in her purse and no change. she spends half the
money on a scarf and gives $1 to a homeless person outside the store. she spends half the
remaining dollars for lunch and tips the waiter $2. she then spends half of what she has
left for a cd, and just before she goes home she spends $3 on a smoothie. she has $1
left. how many dollars did she begin with?

Naomi’s parents want to have 50,000, saved for her college education, if they invest 20000 today and earn 7% interest compound annually, about how long will it take them to save 50 thousand

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

Need now max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.