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3 years ago

8/(-4)+7 help LMFO and explain

Mathematics

2 answers:

Vilka [71]3 years ago

7 0

Answer:

Step-by-step explanation:

reminder of rules for division

• If signs are the same then positive result

• If signs are different the negative result

$\frac{8}{-4}$ + 7 ( signs of division are different )

= - 2 + 7

= 5

zhannawk [14.2K]3 years ago

5 0

Answer:

Step-by-step explanation:

Order of operations PEMDAS / PleasExcuseMyDearAuntSally

1Parentheses 2Exponents 3Multiplication 4Division 5Addition 6Subtraction

8 divided by (-4) + 7 = 5

step 1 parentheses

(-4) = (-4)

(example for other parentheses problems:

8*(12-7)+3 =

step 1

(12-7) = 5

step 2

8*5+3 = 43 )

step 2

(no multiplication or exponents in the problem)

8 divided by (-4) = -2

step 3

-2 + 7 = 5

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The sum of two numbers is 8. Is it possible for the difference of the two numbers to also be 8? Why or why not

r-ruslan [8.4K]

Answer: yes

Step-by-step explanation: because you would get the same number cause anything plus or even divided by 0 then 8 each time you try ex: 8 + 0 = 8

8 - 0 = 8

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3 years ago

The temperature when Spencer arrived at school was a very chilly

dolphi86 [110]

Answer is 13°F

Step-by-step explanation:

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3 years ago

Slope-intercept form of the equation of the line that is perpendicular to -2x + 3y = 10 and contains P(10,-10)

Vlad [161]

Slope intercept: y = mx + b
3y = 2x + 10
Y = 2/3x + 10/3
Perpendicular = opposite sign and reciprocal slope
Y = -3/2x + b
-10 = -3/2(10) + b
-10 = -15 + b, b = 5
Equation: y = -3/2x + 5

8 0

3 years ago

What is 2y/10x equals.

andrew11 [14]

Answer:

$\frac{2y}{10x} = \frac{y}{5x}$

Good luck!

Intelligent Muslim,

From Uzbekistan.

7 0

3 years ago

A college admissions officer takes a simple random sample of 90 entering freshman and computes their mean mathematics sat score

Natalija [7]

Answer:

460 is part of the confidence interval, which means that we cannot say that there is significant evidence that the mean mathematics SAT score for entering freshmen class is greater than 460

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.99}{2} = 0.005$

Now, we have to find z in the Z-table as such z has a p-value of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.005 = 0.995$ , so Z = 2.575.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

$M = 2.575\frac{101}{\sqrt{90}} = 27.4$

The lower end of the interval is the sample mean subtracted by M. So it is 436 - 27.4 = 408.6.

The upper end of the interval is the sample mean added to M. So it is 436 + 27.4 = 463.4.

460 is part of the confidence interval, which means that we cannot say that there is significant evidence that the mean mathematics SAT score for entering freshmen class is greater than 460

6 0

3 years ago