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4 years ago

Why is the product (-6)(-3) is positive?

Mathematics

2 answers:

Mashutka [201]4 years ago

5 0

Because two negs make a positive

katen-ka-za [31]4 years ago

4 0

When you multiply two negatives you receive a positive.
When you subtract two negatives you get a positive.
Lastly, when you add two negatives you receive a negative.
Hope this helped :)

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Answer:

$Pr =0.75$

Step-by-step explanation:

Given

See attachment for wedge

Required

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The sample space of the wedge is:

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Elden [556K]

Answer: 27434

Step-by-step explanation:

Given : Total number of vials = 56

Number of vials that do not have hairline cracks = 13

Then, Number of vials that have hairline cracks =56-13=43

Since , order of selection is not mattering here , so we combinations to find the number of ways.

The number of combinations of m thing r things at a time is given by :-

$^nC_r=\dfrac{n!}{r!(n-r)!}$

Now, the number of ways to select at least one out of 3 vials have a hairline crack will be :-

$^{13}C_2\cdot ^{43}C_{1}+^{13}C_{1}\cdot ^{43}C_{2}+^{13}C_0\cdot ^{43}C_{3}\\\\=\dfrac{13!}{2!(13-2)!}\cdot\dfrac{43!}{1!(42)!}+\dfrac{13!}{1!(12)!}\cdot\dfrac{43!}{2!(41)!}+\dfrac{13!}{0!(13)!}\cdot\dfrac{43!}{3!(40)!}\\\\=\dfrac{13\times12\times11!}{2\times11!}\cdot (43)+(13)\cdot\dfrac{43\times42\times41!}{2\times41!}+(1)\dfrac{43\times42\times41\times40!}{6\times40!}\\\\=3354+11739+12341=27434$

Hence, the required number of ways =27434

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3 years ago

Why is the product (-6)(-3) is positive?​

Why is the product (-6)(-3) is positive?