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3 years ago

What is -4y+7y²+7x-x+3y+x-4y

Mathematics

2 answers:

Dmitrij [34]3 years ago

7 0

Answer:

-5y+7y²+7x

Step-by-step explanation:

Since two opposites add up to zero, remove the from the expression

-4y+7y²+7x3y-4y

Collect like terms

-5y

Answer= -5y+7y²+7x

Zanzabum3 years ago

4 0

Step-by-step explanation:

look at the pic................... hope it helps

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Answer:

x= 3 inch should be turned up on each side

Step-by-step explanation:

Let the height of trough be x.

Width of trough be 12 - 2x.

and length of trough = 120 inch

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For maximum volume, we find V' = 0

i.e 1440 -480x = 0

or x = $\frac{1440}{480}$

or x= 3

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Step-by-step explanation:

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3 years ago

A central angle in a circle with a radius of 3 cm intercepts an arc with a length of 6 cm what is the measure of the central ang

Fiesta28 [93]

Answer:

$114.59\°$

Step-by-step explanation:

we know that

The circumference of a circle is equal to

$C=2\pi r$

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$r=3\ cm$

substitute

$C=2\pi (3)=6 \pi\ cm$

Remember that

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by proportion

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3 years ago

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4 years ago

If 28% of students in College are near-sighted, the probability that in a randomly chosen group of 20 College students, exactly

cluponka [151]

Answer: (D) 16%

Step-by-step explanation:

Binomial probability formula :-

$P(x)=^nC_xp^x(1-p)^n-x$ , where n is the sample size , p is population proportion and P(x) is the probability of getting success in x trial.

Given : The proportion of students in College are near-sighted : p= 0.28

Sample size : n= 20

Then, the the probability that in a randomly chosen group of 20 College students, exactly 4 are near-sighted is given by :_

$P(x=4)=^{20}C_4(0.28)^4(1-0.28)^{20-4}\\\\=\dfrac{20!}{4!16!}(0.28)^4(0.72)^{16}\\\\=0.155326604912\approx0.16\%$

Hence, the probability that in a randomly chosen group of 20 College students, exactly 4 are near-sighted is closest to 16%.

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3 years ago