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ladessa [460]
3 years ago
13

= {16}^{x} " alt=" {x}^{2} = {16}^{x} " align="absmiddle" class="latex-formula">
find the value of X.​
Mathematics
1 answer:
aalyn [17]3 years ago
4 0
The value of x is -1/2 or -.5
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Item 8
ludmilkaskok [199]
So, I didn't quite understand your question clearly, but I'll try my best to answer it.

So, the first question is quite simple: Did the runner have a % decrease in his time or an increase.
Well, 7:45 is minor than 5:51. So, his time decreased.

2nd question:
The percent of change. Well, first things first 7:45 has 2 different units, wich are minutes and seconds, I suppose. Same goes for 5:51.
So let's put everything in seconds. multiply both the 7 and 5 for 60(for every minute has 60 seconds.)

That means:
7*60= 420+45 = 465.
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Now, let's do the math itself:
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 Is equal to about  75,5%
How much did it decrease then?
(75,5-100)%= 24,5%, approximately

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I need your help ASAP!
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