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kondor19780726 [428]
3 years ago
7

1. Find 1/8 x 2/3 *

Mathematics
1 answer:
mash [69]3 years ago
8 0

1. is 1/12. 2. is 1 3/7

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14 is 56% of what number
Sedbober [7]
7.84  <span> 56% off 14 is equal to (56 x 56) / 100 </span>
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Write an expression for the calculation the difference of the products of 5 and 2 and 5 and 1
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(5x2) - (5-1)
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If there are 350 boys in a school with a total of 800 students, then what percent of the students are girls?
tester [92]

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56.25%

Step-by-step explanation:

800 - 350 = 450

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450 divided by 8 = 56.25

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Elsa tries to solve the following equation, and determines there is no solution. Is she correct? Explain.
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Use a matrix to solve the system:
Romashka-Z-Leto [24]

Answer:

(2.83 , 1 , 4)

Step-by-step explanation:

2x+2y-z=4\\4x-2y-2z=2\\3x+3y-4z=-4\\

Rewrite these equations in matrix form

\left[\begin{array}{ccc}2&2&-1\\4&-2&-2\\3&3&-4\end{array}\right] \left[\begin{array}{ccc}x\\y\\z\end{array}\right]=\left[\begin{array}{ccc}4\\2\\-4\end{array}\right] \\

we can write it like this,

AX=B\\X=A^{-1}B

so to solve it we need to take the inverse of the 3 x 3 matrix A then multiply it by B.

We get the inverse of matrix A,

A^{-1}=\left[\begin{array}{ccc}7/15&1/6&-1/5\\1/3&-1/6&0\\3/5&0&-2/5\end{array}\right]  \\

now multiply the matrix with B

X=A^{-1}B\\\\\left[\begin{array}{ccc}x\\y\\z\end{array}\right] =\left[\begin{array}{ccc}7/15&1/6&-1/5\\1/3&-1/6&0\\3/5&0&-2/5\end{array}\right]\left[\begin{array}{ccc}4\\2\\-4\end{array}\right] \\\\\\\left[\begin{array}{ccc}x\\y\\z\end{array}\right] =\left[\begin{array}{ccc}2.83\\1\\4\end{array}\right] \\

4 0
2 years ago
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