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Y_Kistochka [10]
3 years ago
13

What is the value of -(-9)? Explain your reasoning.

Mathematics
2 answers:
Ymorist [56]3 years ago
8 0

Answer:

-(-9) is 9

Step-by-step explanation:

-(-9)

(when there are two negatives multiplyed with eachother, the product will be postive)

+ 9

+ 9  = 9

In-s [12.5K]3 years ago
8 0

- ( - 9 ) =

( - 1 ) × ( - 1 × 9 ) =

( - 1 ) × ( - 1 ) × ( 9 ) =

( + 1 ) × 9 =

1 × 9 =

9

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student randomly receive 1 of 4 versions(A, B, C, D) of a math test. What is the probability that at least 3 of the 5 student te
alexdok [17]

Answer:

1.2%

Step-by-step explanation:

We are given that the students receive different versions of the math namely A, B, C and D.

So, the probability that a student receives version A = \frac{1}{4}.

Thus, the probability that the student does not receive version A = 1-\frac{1}{4} = \frac{3}{4}.

So, the possibilities that at-least 3 out of 5 students receive version A are,

1) 3 receives version A and 2 does not receive version A

2) 4 receives version A and 1 does not receive version A

3) All 5 students receive version A

Then the probability that at-least 3 out of 5 students receive version A is given by,

\frac{1}{4}\times \frac{1}{4}\times \frac{1}{4}\times \frac{3}{4}\times \frac{3}{4}+\frac{1}{4}\times \frac{1}{4}\times \frac{1}{4}\times \frac{1}{4}\times \frac{3}{4}+\frac{1}{4}\times \frac{1}{4}\times \frac{1}{4}\times \frac{1}{4}\times \frac{1}{4}

= (\frac{1}{4})^3\times (\frac{3}{4})^2+(\frac{1}{4})^4\times (\frac{3}{4})+(\frac{1}{4})^5

= (\frac{1}{4})^3\times (\frac{3}{4})[\frac{3}{4}+\frac{1}{4}+(\frac{1}{4})^2]

= (\frac{3}{4^4})[1+\frac{1}{16}]

= (\frac{3}{256})[\frac{17}{16}]

= 0.01171875 × 1.0625

= 0.01245

Thus, the probability that at least 3 out of 5 students receive version A is 0.0124

So, in percent the probability is 0.0124 × 100 = 1.24%

To the nearest tenth, the required probability is 1.2%.

4 0
3 years ago
Triangle congruence and similarity! (picture included)
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Answer:

yes; SAS (Side Angle Side)

Step-by-step explanation:

if you divide all sides by three they come out as the same numbers as the left triangle and they are both the same type of triangle

8 0
2 years ago
A water pitcher contains 2/3 gallons of water you add 5/7 gallons of water to the picture how much water to the picture contain
Shtirlitz [24]
2/3=14/21 and 5/7=15/21 so 14/21+15/21=29/21 or 1 and 8/21
4 0
3 years ago
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Find the value of A , B and C from the following figure​
AveGali [126]

Step-by-step explanation:

Here in the given figure the value of x will be 70° ( being alternative angle )

x = 70°

Now...

y = 60° ( being corresponding angle )

Now...

60° + 70° + z = 180° ( the sum of interior angle of triangle is 180°

z = 180° - 130°

z = 50° ..

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6 0
2 years ago
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Elena-2011 [213]

Answer:

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6 0
3 years ago
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