3 years ago

Help me with this please

Mathematics

1 answer:

Rainbow [258]3 years ago

5 0

Its blurry!!!!!!!!!!!!!

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What is the solution to (x+6)(x+2)=60

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Distribute to eliminate the parenthesis

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Combine like terms

x^2 + 8x + 12 = 60

Subtract 60 from both sides

x^2 + 8x - 48 = 0

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(x+12)(x-4)=0
x+12=0
x+4=0

x= -12 and -4

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3 years ago

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saul85 [17]

Answer:

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Step-by-step explanation:

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3 years ago

On a 10-item test, three students in Professor Hsin's advanced chemistry seminar received scores of 2, 5, and 8, respectively. F

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Answer:

For this distribution of test scores, the standard deviation is equal to the square root of 9

D) 9

Step-by-step explanation:

We need to know the standard deviation formula:

$S=\sqrt{\frac{sum(x-Am)^2}{n-1} }$ (1)

Where:

S: Standard deviation

sum: Summation

x: Sample values

Am: Arithmetic mean

n: Number of terms, in this case 3

Now, we need to know the arithmetic mean of the sample values: 2, 5 and 8

$Am=\frac{2+5+8}{3} = 5$

To know the standard deviation we need to have the summation of each term minus the arithmetic mean squared.

$(x-Am)^2$ of each term:

$(2-5)^2=9\\(5-5)^2=0\\(8-5)^2=9$

Now, we can find the standard deviation:

$S=\sqrt{\frac{9+0+9}{3-1} } \\S=\sqrt{\frac{18}{2} } \\S=\sqrt{9}$

The standard deviation is equal to the square root of 9

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3 years ago

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