Acontainer holds a combination of nickels and quarters. there are 156 coins in all, and their total value is $21.60. the system of equations models this situation, where x is the number of nickels and y is the number of quarters.
x+y=156
0.05x+0.25y=21.6
how many nickels and quarters are in the container?
a.
118 nickels and 38 quarters
b.
106 nickels and 50 quarters
c.
87 nickels and 69 quarters
d.
72 nickels and 84 quarters

When a formula is solved for a particular variable, several different equivalent forms may be possible. if we solved a=1/2bh for h, one possible correct answer is h=2a/b . which one of the following is not equivalent to this? a. h= 2(a/b) b. h= 2a(1/b) c. h= a/1/2b d. h= 1/2a/b

Brian, chris, and damien took a math test that had 20 questions. the number of questions brian got right is 14 more than the number of questions chris got right. damien correctly answered 2 less than the number of questions chris answered correctly. if brian and damien have the same score, which statement is true?

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.