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PolarNik [594]
3 years ago
11

Repost this for help

Mathematics
1 answer:
inna [77]3 years ago
3 0

Answer:

I'm sorry I don't know if I do get an idea I'll come back and edit

Step-by-step explanation:

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Fifteen years from now Ravi's age will be four times his present age.What is Ravi's present age ? Frame the equation and solve.
Archy [21]

Answer:

Ravi's age after 15 years = x+15

Ravi's age = 4 times his present age = 4x

According to question -

15 + x = 4x

=> 15 = 4x-x = 3x

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=> x = 15/3

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Step-by-step explanation:

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A professor records the difference between the marks scored by the students in the class test last week and those scored in the
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Answer: (10.82\ , 13.18)

Step-by-step explanation:

The confidence interval for population mean is given by :-

\mu\pm\ z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}

Given : Sample size : n= 35  , large sample (n>30)

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Standard deviation : \sigma=3

Significance level : \alpha=- 1-0.999=0.001

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12\pm\ (3.4807567)\dfrac{2}{\sqrt{35}}\\\\=12\pm1.18\\\\=(10.82\ , 13.18)

Hence, the  99.9% confidence interval for the mean difference between the marks scored last week and marks scored this week by all the students = (10.82\ , 13.18)

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2 years ago
10x +1 12x-5 solve for x
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Answer:

x = 3

Step-by-step explanation:

10x + 1 = 12x - 5

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Subtract 12x from each side

-2x = -6

Divided by -2

x = 3

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