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3 years ago

Simplify the expression: -1/2 (-5/6 + 1/3)

Mathematics

1 answer:

Kazeer [188]3 years ago

3 0

Answer:

Exact Form:

1/6

Decimal Form:

0.16 (6 repeating)

Step-by-step explanation:

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Answer:

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2 years ago

A grower believes that one in five of his citrus trees are infected with the citrus red mite. How large a sample should be taken

kotegsom [21]

Answer: 68

Step-by-step explanation:

Formula for sample size when prior estimate of population proportion (p) is available: $n=p(1-p)(\dfrac{z^*}{E})^2$

, where z*= critical-value.

E= Margin of error.

Let p be the population proportion of trees are infected with the citrus red mite.

As per given , we have

$p=\dfrac{1}{5}=0.2$

E= ± 0.08

The critical z-value corresponding to 90% confidence level = z*=1.645

Substitute all the values in the above formula , we get

Required sample size : $n=(0.2)(1-0.2)(\dfrac{(1.645)}{0.08})^2$

$\Rightarrow\ n=(0.2)(0.8)(20.5625)^2$

$\Rightarrow\ n=0.16(422.81640625)\\\\\Rightarrow\ n=67.650625\approx68$ [Rounded to next integer.]

Thus, the minimum sample size should be taken =68

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2 years ago

Write the equation of the line that passes through the points (2, 1) and (-8, -8).

wariber [46]

Answer:

Step-by-step explanation:

Find the distance between the given points: (-7, 5) and (-8, 4)

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2 years ago

How many 5-letter combinations can be created from the letters in the word "friendly"?

avanturin [10]

Answer:

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hope this helps :)

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2 years ago