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choli [55]
3 years ago
14

Solve -3 = x + x + x. -5 -1 -1

Mathematics
1 answer:
KatRina [158]3 years ago
3 0

Answer:

-1

Step-by-step explanation:

-3=x+x+x

-3=3x

3x=-3

x=-3/3=-1

x=-1

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A student finished 72 of her homework problems in class. If the ratio of problems she finished to problems she still had left wa
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Finished:Left

8:1

8/1 = 72/x

Cross Multiply

8x=72

divide each side by 8

x=9

She already finished 72 and has 9 remaining

Total = Finished + Remaining = 72 + 9 = 81

4 0
3 years ago
A random sample of 121 automobiles traveling on an interstate showed an average speed of 73 mph. from past information, it is kn
tatiyna

121 is big enough to assume normality and not worry about the t distribution. By the 68-95-99.7 rule a 95% confidence interval includes plus or minus two standard deviations. So 95% of the cars will be in the mph range


(73 - 2 \cdot 11, 73 + 2 \cdot 11) = (51,95)


The question is a bit vague, but it seems we're being asked for the 95% confidence interval on the average of 121 cars. The 121 is a hint of course.


The standard deviation of the average is in general the standard deviation of the individual samples divided by the square root of n:


\sigma = \dfrac{ 11}{\sqrt{121}} = 1


So repeating our experiment of taking the average 121 cars over and over, we expect 95% of the averages to be in the mph range


(73 - 2 \cdot 1, 73 + 2 \cdot 1) = (71,75)


That's probably the answer they're looking for.



4 0
3 years ago
The sum of 21 and twice a number is -19 what is the number
skelet666 [1.2K]
The correct answer would be -23
8 0
2 years ago
Look at photo asap please <br><br><br><br><br><br><br>​
aivan3 [116]

Answer:

option D is correct.

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3 0
3 years ago
Please help (puppy eyes)
-Dominant- [34]
First we have to find the decimal equivalent by dividing.
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Since the decimal does end it can't be non-terminating, non-repeating

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7 0
4 years ago
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