3 years ago

How many ways can a group of 8 students be selected from 9 students?

Mathematics

1 answer:

antoniya [11.8K]3 years ago

7 0

9!/(8!*(9-8)!)=9
or just use a calculator and use the nCr function

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SOLVING EACH SYSTEM BY ELIMINATION x+3y=5 x=-6y+14 HELP

nata0808 [166]

Answer:

$\mathrm{The\:solutions\:to\:the\:system\:of\:equations\:are:}$

$x=-4,\:y=3$

Step-by-step explanation:

Given the system of the equations

$x+3y=5;\:x=-6y+14$

solving by elimination method

$\begin{bmatrix}x+3y=5\\ x=-6y+14\end{bmatrix}$

$\mathrm{Arrange\:equation\:variables\:for\:elimination}$

$\begin{bmatrix}x+3y=5\\ x+6y=14\end{bmatrix}$

$x+6y=14$

$-$

$\underline{x+3y=5}$

$3y=9$

$\begin{bmatrix}x+3y=5\\ 3y=9\end{bmatrix}$

solve $3y=9$ for $y$ :

$3y=9$

$\frac{3y}{3}=\frac{9}{3}$

$y=3$

$\mathrm{For\:}x+3y=5\mathrm{\:plug\:in\:}y=3$

Solve $x+3\cdot \:3=5$ for x:

$x+3\cdot \:3=5$

$x+9=5$

$x=-4$

Therefore,

$\mathrm{The\:solutions\:to\:the\:system\:of\:equations\:are:}$

$x=-4,\:y=3$

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Solve the inequlaity. 5c-20 is greater than or equal to 15c+10

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Its less than..........

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The sum of two numbers is 13. two times the first number minus three times the second number is 1. if you let "x"stand for the f

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Y=8 and x=5
i hope i helped! ;)

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seraphim [82]

Answer:

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Step-by-step explanation:

to find area, the eqaution is length times width

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Step-by-step explanation:

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