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ycow [4]
3 years ago
8

A box contains a $1 bill, a $5 bill, a $10 bill, and a $20 bill. If two bills are selected at random what is the probability tha

t the total value of the two bills is at least $15?
Mathematics
2 answers:
pshichka [43]3 years ago
6 0

Answer:

50%

Step-by-step explanation:

Because you can get either 1 and 5 which is 6 or 10 and 1 whoch is 11 but the other two will give you 15+

makkiz [27]3 years ago
5 0

Answer; It would be 15 out of 36

Step-by-step explanation:

So you have $1,$5,$10, and $20 so if you add them all up you get sixteen and the probability that the total  value of the two bills is at least $15 then the chance would be $15 out of $36.

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ehidna [41]

We want to find the values of a, b, c, and d such that the given matrix product is equal to a 2x2 identity matrix. We will solve a system of equations to find:

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<h3>Presenting the equation:</h3>

Basically, we want to solve:

\left[\begin{array}{cc}-1&2\\a&1\end{array}\right]*\left[\begin{array}{cc}b&c\\1&d\end{array}\right] = \left[\begin{array}{cc}1&0\\0&1\end{array}\right]

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we know the value of b, so we just have:

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c = 2d

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If you want to learn more about systems of equations, you can read:

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swat32
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