1. There are 9 blue marbles in a box. How many groups of 4 marbles are possible?
2. There are 12 boys in a class. In how many ways can they group
themselves by 6?
3. How many group of 5 red cards can be drawn from a deck of 12 red
cards?
4. In how many ways can 8 students seat in arrow of 5. chairs?
5. How many letters of the word GRACIOUS both begin and end with a
vowel?​

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

Cor d? ? me ? 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.

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.