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3 years ago

−3−(−5) PLease Help me

Mathematics

2 answers:

TiliK225 [7]3 years ago

5 0

Answer:

Step-by-step explanation:

Simplify the expression.

TEA [102]3 years ago

5 0

Answer:

Step-by-step explanation:

Two subtraction/negative signs make a positive so it's pretty much -3 + 5

So if you take 3 away from 5 you are left with 2

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Plzzz Select the correct answer.

krek1111 [17]

Answer: D:

To get system B, the second equation in system A was replaced by the sum of that equation and the first equation multiplied by 5. The solution to system B will be the same as the solution to system A.

Step-by-step explanation:

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2 years ago

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What is the x in 4x+20?

Galina-37 [17]

Answer:

the answer is 5 because if you divide it its your answer

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3 years ago

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I will make up the BRAINLIEST!!!ls tell me the ......distinguish between expression and equation algebraically by providing an e

Andrej [43]

A math expression is anything where you take one or more numbers and add them, subtract them, multiply, divide, etc etc

For example, 2+3 is a math expression

To make it an algebraic expression, we replace one of the numbers with a variable. Often this is the letter x. So let's say we replace the 2 with x. That would have the expression turn into x+3. What we're saying is "some number plus 3"

Normally 2+3 = 5 which is a true equation. Replace the 2 with x and we have x+3 = 5. So we're saying "some number plus 3 is 5". You can guess and check to find that the "some number" has to be 2

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In summary, the expression example was x+3 and the equation was x+3 = 5

Note: an equation is simply two expressions set equal to each other.

3 0

3 years ago

A survey is to be conducted to determine the average driving in miles by Minnesota State University, Mankato students. The inves

Nadusha1986 [10]

Answer:

$n=(\frac{1.75(8.2)}{1.5})^2 =91.52 \approx 92$

So the answer for this case would be n=92 rounded up to the nearest integer

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

s represent the sample standard deviation

n represent the sample size

Solution to the problem

The margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (a)

And on this case we have that ME =1.5 and we are interested in order to find the value of n, if we solve n from equation (b) we got:

$n=(\frac{z_{\alpha/2} \sigma}{ME})^2$ (b)

The critical value for 92% of confidence interval now can be founded using the normal distribution. And in excel we can use this formla to find it:"=-NORM.INV(0.04;0;1)", and we got $z_{\alpha/2}=1.75$ , replacing into formula (b) we got:

$n=(\frac{1.75(8.2)}{1.5})^2 =91.52 \approx 92$

So the answer for this case would be n=92 rounded up to the nearest integer

5 0

3 years ago

2/3 -4 x + 7/2 = -9x + 5/6

antoniya [11.8K]

Answer:

x= -2/3

Step-by-step explanation:

Add fractions (2/3, 7/2) 2/3+7/2=25/6

Move variable

Move constant

Collect like terms (-4x, 9x) -4x+9x=5x

Subtract the fractions 5/6-25/6=-10/3

Divide 5x=-2/3 x=-2/3

I'm not exactly sure how you want me to explain the answer but I hope that simplified answer helps.

8 0

3 years ago