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Valentin [98]
3 years ago
14

8/2(2+2) please help

Mathematics
2 answers:
AnnyKZ [126]3 years ago
6 0

Answer:

The answer is simply is 16.

Step-by-step explanation:

It is important to use PEMDAS. P stands for parenthesis, e stands for exponets, m stands for multiplication, d stands for division, a stands for addition, s stands for subtraction. So, lets start. Do we have any parenthesis? Yes, we do. That is (2+2). Well 2+2 is 4. Now your new equation would be 8/2(4). Do we have any exponets? No. do we have any multiplication? no. Do we have any division? yes.8/2 is 4. so now we have 4(4). And 4 times 4 is 16. Feel free to clarify if you have any questions.

Semenov [28]3 years ago
4 0

Answer:

16

Step-by-step explanation:

Use the order PEMDAS

So, parenthesises first.

(2 + 2)

= 4

Then divide.

8/2

= 4

Then multiply.

4(4)

= 16

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Charlotte’s weekly paycheck is based on the number of hours worked during the week and on the weekend. If she works 13 hours dur
Gelneren [198K]
I am setting the week hourly rate to x, and the weekend to y.  Here is how the equation is set up:

13x + 14y = $250.90
15x + 8y = $204.70

This is a system of equations, and we can solve it by multiplying the top equation by 4, and the bottom equation by -7.  Now it equals:

52x + 56y = $1003.60
-105x - 56y = -$1432.90

Now we add these two equations together to get:

-53x = -$429.30 --> 53x = $429.30 --> (divide both sides by 53) x = 8.10.  This is how much she makes per hour on a week day.

Now we can plug in our answer for x to find y.  I am going to use the first equation, but you could use either.

$105.30 + 14y = $250.90.  Subtract $105.30 from both sides --> 14y = $145.60 divide by 14 --> y = $10.40

Now we know that she makes $8.10 per hour on the week days, and $10.40 per hour on the weekends.  Subtracting 8.1 from 10.4, we figure out that she makes $2.30 more per hour on the weekends than week days.
7 0
3 years ago
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Find the minimum sample size needed to estimate the percentage of Democrats who have a sibling. Use a 0.1 margin of error, use a
Brums [2.3K]

Answer:

The minimum sample size is  n  =135

Step-by-step explanation:

From the question we are told that

   The confidence interval is ( lower \ limit  = \  0.44,\ \ \   upper \ limit  = \ 0.51)

    The margin of error is  E =  0.1

   

Generally the sample  proportion can be mathematically evaluated as

     \r p = \frac{ upper \ limit  + lower \ limit }{2}

    \r p = \frac{ 0.51 + 0.44}{2}

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Given that the confidence level is  98% then the level of significance can be mathematically evaluated as

         \alpha = 100 -  98

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        \alpha =0.02

Next we obtain the critical value of  \frac{\alpha }{2} from the normal distribution table  

   The value is

        Z_{\frac{\alpha }{2} } =  2.33

Generally the minimum sample size is evaluated as

      n  =[ \frac { Z_{\frac{\alpha }{2} }}{E} ]^2 *  \r p (1- \r p )

     n  =[ \frac { 2.33}{0.1} ]^2 *  0.475(1- 0.475 )

     n  =135

6 0
3 years ago
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