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REY [17]
3 years ago
6

there are 28 books on the shelf.one-fourth of the books are about animals. two are adventure. the rest are mystery.How many book

s are mystery show your work.plz help
Mathematics
1 answer:
yanalaym [24]3 years ago
4 0

Answer:

19

Step-by-step explanation:

1/4 are animal. 28/4 = 7

2 are adventure.

7+2 = 9

9 are not mystery

28-9 = 19

19 are mystery.

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Answer:

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Step-by-step explanation:

Given the system of three equations:

\left\{\begin{array}{l}x-2y+3z=-2\\6x+2y+2z=-48\\x+4y+3z=-38\end{array}\right.

Write the augmented matrix for the system of equations

\left(\begin{array}{ccccc}1&-2&3&|&-2\\6&2&2&|&-48\\1&4&3&|&-38\end{array}\right)

Find the reduced row-echelon form of the augmented matrix for the system of equations:

\left(\begin{array}{ccccc}1&-2&3&|&-2\\6&2&2&|&-48\\1&4&3&|&-38\end{array}\right)\sim \left(\begin{array}{ccccc}1&-2&3&|&-2\\0&-14&16&|&36\\0&-6&0&|&36\end{array}\right)\sim \left(\begin{array}{ccccc}1&3&-2&|&-2\\0&16&-14&|&36\\0&0&-6&|&36\end{array}\right)

Thus, the system of three equations is

\left\{\begin{array}{r}x+3z-2y=-2\\16z-14y=36\\-6y=36\end{array}\right.

From the last equation:

y=-6

Substitute it into the second equation:

16z-14\cdot (-6)=36\\ \\16z=36-84\\ \\16z=-48\\ \\z=-3

Substitute y = -6 and z = -3 into the first equation:

x+3\cdot (-3)-2\cdot (-6)=-2\\ \\x=-2+9-12\\ \\x=-5

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3 years ago
What’s that answer??
weqwewe [10]

The answer is B for the first part, and I think the solution is (6,7).

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Step-by-step explanation:

120-40=80

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80/24=

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