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2 years ago

42 out of 56 students have cell phone. What percent of students said they owned a cell phone

Mathematics

1 answer:

sesenic [268]2 years ago

6 0

Answer:

75%

Step-by-step explanation:

now we can see that our fraction is 75/100 which means that 42/56 as a percentage is 75%

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Someone please help out! Really need to pass :(

ValentinkaMS [17]

Answer:

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Step-by-step explanation:

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3 years ago

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Given that the expression 2x^3 + mx^2 + nx + c leaves the same remainder when divided by x -2 or by x+1 I prove that m+n =-6

Alla [95]

Given:

The expression is:

$2x^3+mx^2+nx+c$

It leaves the same remainder when divided by x -2 or by x+1.

To prove:

$m+n=-6$

Solution:

Remainder theorem: If a polynomial P(x) is divided by (x-c), thent he remainder is P(c).

Let the given polynomial is:

$P(x)=2x^3+mx^2+nx+c$

It leaves the same remainder when divided by x -2 or by x+1. By using remainder theorem, we can say that

$P(2)=P(-1)$ ...(i)

Substituting $x=-1$ in the given polynomial.

$P(-1)=2(-1)^3+m(-1)^2+n(-1)+c$

$P(-1)=-2+m-n+c$

Substituting $x=2$ in the given polynomial.

$P(2)=2(2)^3+m(2)^2+n(2)+c$

$P(2)=2(8)+m(4)+2n+c$

$P(2)=16+4m+2n+c$

Now, substitute the values of P(2) and P(-1) in (i), we get

$16+4m+2n+c=-2+m-n+c$

$16+4m+2n+c+2-m+n-c=0$

$18+3m+3n=0$

$3m+3n=-18$

Divide both sides by 3.

$\dfrac{3m+3n}{3}=\dfrac{-18}{3}$

$m+n=-6$

Hence proved.

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3 years ago

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Step2247 [10]

Answer:

Corresponding in character.

Step-by-step explanation:

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3 years ago

Book costs $5.25 plus sales tax. After sales tax, the book is $5.58. What is the sales tax rate?

Karolina [17]

5,25-5,58=0,33

The answer is $0,33

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3 years ago

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Which equation can be used to determine the distance between the origin and (-2,-4)?

Olegator [25]

So the right answer is of option B..

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3 years ago

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