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Alinara [238K]
3 years ago
11

What's (6x+8)(5x-1) Can you help me solve it please

Mathematics
1 answer:
11111nata11111 [884]3 years ago
3 0
(6x+8)(5x-1)=30x^2-6x+40x-8=30x^2+34x-8
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If f(x)=3x5−10x3+5, on what intervals is f″(x)>0?
Ksivusya [100]

Answer:

(0.7937,\infty)

Step-by-step explanation:

we are given an algebraic function in x, such that

f(x) = 3x^5-10x^3+5

To find when second derivative >0

For this let us find first and second derivative by successive differentiation.

f(x) = 3x^5-10x^3+5\\f'(x) =15x^4-30x^2\\f'(x)=60x^3-30

when ii derivative >0 we have

60x^3-30>0

x^3>0.5\\x>0.7937

f"(x)>0 in

(0.7937,\infty)

5 0
3 years ago
How to get x and y what the answers and how to get the answer
zhuklara [117]
ITS SIMPLE USE THE CORDANITS LIKE 13-10 13 OVER 10 UP 
4 0
3 years ago
Which unit should be used to measure mass of pencil?
alexandr402 [8]

Answer:

Grams

Step-by-step explanation:

Pencils are pretty light, so they should be measured in grams.

4 0
3 years ago
Read 2 more answers
In which graph is y a direct variation of x?<br> A.<br> B.<br> C.<br> D.
TEA [102]

Answer:

D

Step-by-step explanation:

The line is going through the origin.

8 0
3 years ago
Suppose we are interested in analyzing the weights of NFL players. We know that on average, NFL players weigh 247 pounds with a
Diano4ka-milaya [45]

Answer:

a) The standard error would be of 8.58 pounds.

b) The margin of error is 14.11 pounds.

c) The 90% confidence interval for the population mean is between 232.89 pounds and 261.11 pounds

Step-by-step explanation:

a.What is the standard error?

The standard error is

s = \frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample. So

s = \frac{47}{\sqrt{30}} = 8.58

The standard error would be of 8.58 pounds.

b.What is the margin of error at 90% confidence?

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.9}{2} = 0.05

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.05 = 0.95, so z = 1.645

Now, find the margin of error M as such

M = z*s = 1.645*8.58 = 14.11

The margin of error is 14.11 pounds.

c. Using my sample of 30, what would be the 90% confidence interval for the population mean?

Lower bound: Sample mean subtracted by the margin of error.

247 - 14.11 = 232.89 pounds

Upper bound

247 + 14.11 = 261.11 pounds

The 90% confidence interval for the population mean is between 232.89 pounds and 261.11 pounds

4 0
3 years ago
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