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rosijanka [135]
3 years ago
12

Write a number that rounds to 30,000 if we are rounding to the nearest ten thousand

Mathematics
1 answer:
Nookie1986 [14]3 years ago
6 0
28,567 rounds to 30,000 if we are rounding to the nearest ten thousand
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If 5a=-4b+5 and 3a=-2b+3, what is 6b?
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There are two equations and two variables. You can solve for each variable using either the elimination method or the substitution method. Here, I believe the elimination method would be best:
5a = -4b + 5
3a = -2b + 3
You can multiply the second equation by two, so the 4b and -4b in both equations will cancel each other out when you add them. So:
5a = -4b +5
6a = 4b +6
Add both equations together.
11a = 11
a = 1
Plug in the a value into any of the previous equations:
5(1) = -4b + 5
-4b = 0
b = 0
So, since we know that b = 0, 6b is also 0.
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