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Lubov Fominskaja [6]
3 years ago
7

Subtracting Integers! What is (-10) - 9?

Mathematics
2 answers:
klio [65]3 years ago
4 0
The answer is (-10) - 9= -19
guapka [62]3 years ago
4 0
(-10) - 9
(-10) + (-9)
A negative plus a negative is a positive
Therefore,
19 is your answer
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5x+7y=31 2x+4y=16 Which of the following systems could be used to solve the given system of equations by the addition method? 10
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Equation 1: 5x+7y=31
Equation 2: 2x+4y=16

We can either use the 'elimination' method or the 'substitution' method to solve this simultaneous equation.

In some cases one method is easier to use than the other. For this one, it would be easier to use the elimination method

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Equation 2: 10x+20y=80

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3 years ago
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Step-by-step explanation:

When there is no replacement , we use combination to find the number of ways to choose things.

Number of ways to choose r things out of  ( with out replacement) = ^nC_r=\dfrac{n!}{r!(n-r)!}

The number of ways to choose  8 things = ^8C_8=\dfrac{8!}{8!(8-8)!}=\dfrac{1}{0!}=1  [\because 0!=1]

Hence,  Number of ways =\dfrac{8!}{8!0!}\ or \ 1

5 0
2 years ago
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