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Ivanshal [37]
4 years ago
9

What are the solutions to x2 + 8x + 7 = 0?

Mathematics
1 answer:
Lelechka [254]4 years ago
6 0

Answer:

B

Step-by-step explanation:

x² + 8x + 7 = 0

x²+x+7x+7=0

x(x+1)+7(x+1)=0

(x+1)(x+7)=0

Either x=-1or x=-7.

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The weight of male american between the ages 18 to 25 is normally distributed, with mean of 162.7 lb and a standard deviation of
MArishka [77]

Answer:

218.7 lb.

Step-by-step explanation:

We have been given that the  weight of male american between the ages 18 to 25 is normally distributed, with mean of 162.7 lb and a standard deviation of 28 lb.

One definition of obesity states that a person is obese if the z-score of his or her weight is greater than 2.

We will use z-score formula to solve our given problem.

z=\frac{x-\mu}{\sigma}, where,

z=\text{ z-score},

x=\text{ Random sample-score},

\mu=\text{ Mean},

\sigma=\text{ Standard deviation}.

Upon substituting our given values in z-score formula we will get,

2=\frac{x-162.7}{28}

Now let us solve for x.

Upon multiplying both sides of our equation by 28 we will get,

2*28=\frac{x-162.7}{28}*28

56=x-162.7

Let us add 162.7 to both sides of our equation.

56+162.7=x-162.7+162.7

218.7=x

Therefore, the obesity threshold weight for a young adult American male is 218.7 pounds.

6 0
3 years ago
Read 2 more answers
Please help me solve either one will mark brainliest!! thank you!! Easy
RoseWind [281]

Answer:

A is A=2(1+2)a2

B is A≈208.18cm²

Step-by-step explanation:

A explanation is A=2(1+2)a2=2·(1+2)·102≈482.84271

B explanation is A=145(5+25)a2=14·5·(5+2·5)·112≈208.17777cm²

3 0
3 years ago
Read 2 more answers
The equation of the line of best fit of a scatter plot is y = −8x + 3. What is the the y-intercept?
UkoKoshka [18]

Answer:

C. 3

Step-by-step explanation:

The y intercept will always be the 'b' in the formula

y= mx+b

since your formula is y = -8x +3, and 3 is in the place of "b", your y intercept will be 3

4 0
3 years ago
Read 2 more answers
When a result from a simple is extended to the population
hjlf

Answer:

You can opt to study the entire population when the population is well defined(Complete sampling frame) and small.

It can eliminate any potential bias occurring through sampling technique, but other than that it is really not justified to consume more resources and time.

6 0
3 years ago
Find the area of the shaded region
Levart [38]

Answer:

Answers below

Step-by-step explanation:

7. Area of shape - area of small shape

A(s) = 5*5 = 25 - A(ss) = 3 = 25-3 = 22

8. Area of shape - area of small shape

A(s) = 4*2 = 8 - A(ss) = 1 = 8-1 = 7

5 0
3 years ago
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