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2 years ago

What is the minimum and maximum of f(x)=-10x^3+6x-2

Mathematics

1 answer:

const2013 [10]2 years ago

5 0

Answer:

Minimum: $(\frac{\sqrt{5} }{5},-2+\frac{4\sqrt{5} }{5})$

Maximum: $(-\frac{\sqrt{5} }{5} ,-2-\frac{4\sqrt{5} }{5} )$

Step-by-step explanation:

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Alabama papas must average 80 on five test . Scores on the first four test were 81 73 84 and 76 what is the lowest score she can

Salsk061 [2.6K]

She has to score at least 86 on her fifth test.

Further explanation:

We will use the average formula to find the fifth value.

Given

$Average\ required=80\\x_1=81\\x_2=73\\x_3=84\\x_4=76\\x_5=?$

We have to find x5

The formula for average is:

$x=\frac{Sum\ of\ values}{Total\ number\ of\ values}\\Here,\\n=5\\So,\\x=\frac{x_1+x_2+x_3+x_4+x_5}{5}\\Putting\ values\\80=\frac{81+73+84+76+x_5}{5}$

$80*5=314+x_5\\400=314+x_5\\x_5=400-314\\x_5=86$

She has to score at least 86 on her fifth test.

Keywords: Average, Word Problems

Learn more about average at:

#LearnwithBrainly

7 0

3 years ago

What is the value of fraction 1 over 2x3 + 5.2y when x = 2 and y = 3?

Leokris [45]

The answer should be 18.6, just substitute x for 2 and y for 3 and solve using PEMDAS :)

6 0

3 years ago

Problem solving 123456 to multiplication using all the numbers once

Degger [83]

Answer:

720.

Step-by-step explanation:

1*2*3*4 * 5*6

= 24 * 30

= 720.

Splitting it up in this way makes it easier.

5 0

2 years ago

What is the answer to 2x+8

Sloan [31]

2x + 8.....factor = 2(x + 4)

6 0

3 years ago

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A scientist estimated that a mixture would need 4 milliliters of a chemical to balance. The actual amount needed was 7 millilite

Butoxors [25]

42.86% error was in the scientist's estimation.

Step-by-step explanation:

Given data;

Approx amount = 4 ml

Exact amount needed = 7 ml

Percentage error = $\frac{|Approx-Exact|}{Exact}*100$

$Percentage\ error=\frac{|4-7|}{7}*100\\Percentage\ error=\frac{|-3|}{7}*100\\Percentage\ error=\frac{3}{7}*100\\\\Percentage\ error=\frac{300}{7}\\Percentage\ error= 42.86\%$

42.86% error was in the scientist's estimation.

Keywords: error, percentage

Learn more about percentages at:

#LearnwithBrainly

6 0

3 years ago

Read 2 more answers