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Anni [7]
2 years ago
9

Find the roots of this equation 7xsquare - 5x - 2 = 0

Mathematics
1 answer:
Sophie [7]2 years ago
7 0

Answer:

x = 1, -2/7

Step-by-step explanation:

You could use the quadratic equation but this can be factored into

(7x + 2) (x - 1).  You can verify that by multiplying it out.

Since (7x + 2) (x - 1) = 0, if either factor is 0 then the equation would be equal to 0, thus we get x = 1, -2/7

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A sample of 50 observations is taken from an infinite population. The sampling distribution of : a.is approximately normal becau
Korvikt [17]

Answer:

a.is approximately normal because of the central limit theorem.

Step-by-step explanation:

The central limit theorem states that if we have a population with mean μ and standard deviation σ and we take sufficiently large random samples from the population with replacement, then the distribution of the sample means will be approximately normally distributed.

For any distribution if the number of samples n ≥ 30, the sample distribution will be approximately normal.

Since in our question, the sample of observations is 50, n = 50.

Since 50 > 30, then <u>our sample distribution will be approximately normal because of the central limit theorem.</u>

So, a is the answer.

3 0
2 years ago
Image down below plz help
soldi70 [24.7K]

Answer:

A

Step-by-step explanation:

I feel strongly that it is A.

5 0
2 years ago
-5×+3y=51 <br> Y=10×-8 can you help explain how to get the answer
Strike441 [17]

Answer: x=2.4

Step-by-step explanation: I believe that you plug what y equals into the x value so both variable are x and you can solve for x

4 0
3 years ago
You roll four six-sided die. Find the probability that exactly three of the <br> dice are odd.
s344n2d4d5 [400]

Answer:

3/8

Step-by-step explanation:

There is a 1/2 probability one die will be odd because 1, 3, and 5 are the only possible odd numbers.

Since you want 3/4 of the dice to be odd, you multiply 1/2 by 3/4 to get 3/8.

I believe it is 3/8.

3 0
3 years ago
Read 2 more answers
The train station clock runs too fast and gain 11 minutes every 3 days. How many minutes and seconds will it have gained at the
WARRIOR [948]
660sec in 3 days.
So 220sec per days
220•5= 1100
1100sec = 18min and 30 second.

Ans:
18min and 30 sec
5 0
2 years ago
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