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omeli [17]
3 years ago
15

PLEASE HELP ASAP (MORE THEN ONE ANSWER)

Mathematics
1 answer:
r-ruslan [8.4K]3 years ago
6 0
When we say "closed under addition" in the context of rational numbers, we mean to say that when we add up rational numbers then, the sum is also a rational number. 

From the given choices above, the one that should the characteristic of being "closed under addition" is only fourth equation. Both 1/2 and 0.5 are rational numbers. On the other hand, 1 is also a rational number. 
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soory this is for points

Step-by-step explanation:

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For this line, list the x and y intercepts. -25x+40y-200=0 <br><br>x-int:______<br>y-int:______​
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The temperature rose 4 f every 90 minutes before noon and rose 2 f for every 45 minutes after noon are these rates equivalent
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4 0
3 years ago
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Robert has seven more than five times the number of video games that Samuel has. The total number of video games that Robert and
yuradex [85]

Answer: Robert has 22 video games.

Step-by-step explanation:

Let be "r" the number of video games that Robert has and "s" the the number of video games that Samuel has.

Set up a system of equations:

\left \{ {{r=5s+7} \atop {r+s=25}} \right.

You can use the substitution method to solve the system:

- You need to substitute the first equation into the second equation and solve for "s":

(5s+7)+s=25\\\\6s=25-7\\\\s=\frac{18}{6}\\\\s=3

- Finally you must substitute the value of "s" into the first equation and evaluate:

r=5(3)+7\\\\r=22

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3 years ago
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