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Molodets [167]
3 years ago
6

Which expression is even for all integers a and b?

Mathematics
2 answers:
jenyasd209 [6]3 years ago
4 0

Answer:

Pretty sure it's ab + ab

Step-by-step explanation:

Taking the test myself.. if it needs to be even for all integers and it doesn't give us numbers for a or b then ab + ab is the only "even for all integers"

Irina18 [472]3 years ago
3 0
Do u have a problem that went with this?

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if you make $300 and you spend $237 and then you make $40 more and spend $60 how much money do you have left?
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A survey is planned to estimate the proportion of voters who support a proposed gun control law. The estimate should be within a
laila [671]

Complete Question

A survey is planned to estimate the proportion of voters who support a proposed gun control law. The estimate should be within a margin of error of ±5% with 90% confidence, and we do not have any prior knowledge about the proportion who might support the law. How many people need to be included in the sample?

Round your answer up to the nearest integer.

sample size = _____

Answer:

The sample size is n = 271    

Step-by-step explanation:

From the question we are told that  

   The margin of error is  E = 5% = 0.05

Generally given that there was no prior knowledge about the proportion of who might support the law, we will assume the sample proportion to be  

     \^ p =  0.5

From the question we are told the confidence level is  90% , hence the level of significance is    

      \alpha = (100 - 90 ) \%

=>   \alpha = 0.05

Generally from the normal distribution table the critical value  of  \frac{\alpha }{2} is  

   Z_{\frac{\alpha }{2} } =  1.645

Generally the sample size is mathematically represented as  

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

=>   n = [\frac{1.645 }{0.05} ]^2 * 0.5 (1 - 0.5 )

=>   n = 271    

5 0
3 years ago
The radius of this ball is 15 inches. Which equation gives the ball's surface area, in square inches?
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This is represented by the formula given in the lower left.

8 0
3 years ago
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Dafna1 [17]
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If something was discounted 65%, that means you are paying 35% for it. 
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x = 58 

The swimsuit was originally 58 dollars. 
8 0
3 years ago
Read 2 more answers
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