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ikadub [295]
2 years ago
12

The polynomial 2x3 − 5x2 + 4x − 10 is split into two groups, 2x3 + 4x and −5x2 − 10. The GCFs of each group is then factored out

.
What is the common binomial factor between the two groups after their GCFs have been factored out?


2x + 5

2x − 5

x2 − 2

x2 + 2
Mathematics
2 answers:
Ugo [173]2 years ago
8 0

Answer: \\ 2 {x}^{3}  -  5 {x}^{2}  + 4x - 10 \\  = (2 {x}^{3}  + 4x) - (5 {x}^{2}  + 10) \\  = 2x( {x}^{2}  + 2) - 5( {x}^{2}  + 2) \\  = ( {x}^{2}  + 2)(2x - 5) \\ Common  \: binomial \:  factor:2x - 5

natita [175]2 years ago
3 0

2x³ - 5x² + 4x - 10

(2x³ + 4x) + (-5x² - 10)

2x(x² + 2) - 5(x² + 2) = x² + 2

Answer is Choice D. x² + 2

i hope this helped!

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A sample of 10 adult elephants had an average weight of 12,556 pounds. The standard deviation
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Answer:

The 99% confidence interval of the population mean for the weights of adult elephants is between 12,475 pounds and 12,637 pounds.

Step-by-step explanation:

We have the standard deviation for the sample, so we use the t-distribution to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 10 - 1 = 9

99% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 9 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.99}{2} = 0.995. So we have T = 3.25

The margin of error is:

M = T*s = 3.25*25 = 81

In which s is the standard deviation of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 12,556 - 81 = 12,475 pounds

The upper end of the interval is the sample mean added to M. So it is 12,556 + 81 = 12,637 pounds.

The 99% confidence interval of the population mean for the weights of adult elephants is between 12,475 pounds and 12,637 pounds.

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