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victus00 [196]
4 years ago
5

Battery was charged. when the charging began it was 23% full after 30 minutes of charging the battery was 89% full. how fast was

the battery charged? How long did it take the battery to be funny charged?
Mathematics
2 answers:
MrRissso [65]4 years ago
7 0
<span>The battery was charged at a rate of <span><span>2.2 </span></span>percent per minute.It took the battery <span><span>35</span></span> minutes to be fully charged.</span>
sukhopar [10]4 years ago
5 0

Answer:

The battery was charged at a rate of 2.2 % per minute.

It took 35 minutes to fully charge the battery

Step-by-step explanation:

Initial amount of charge = 23%

Charge after 30 minutes = 89%

Percentage of charge gained in 30 minutes = 89-23

                                                                         = 66 %

Charging speed of battery = \frac{percentage\hspace{3}of\hspace{3}charge\hspace{3}gained}{time\hspace{3}taken\hspace{3}in\hspace{3}minutes}

= \frac{66}{30}

= 2.2 % per minute

2.2% charge takes 1 minutes

1% charge takes \frac{1}{2.2} minutes

Initially it was 23% charged so it needs 77% more charge to be fully charged.

So, 77% charge takes \frac{1}{2.2}*77 minutes    

                         =  \frac{100}{2.2} minutes

                         = 35 minutes

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Step-by-step explanation:

Given the question :

Jane evaluates x squared minus 3 x + 5 for x = negative 2 below. Step 1: (negative 2) squared minus 3 (negative 2) + 5 Step 2: Equals negative 4 + 6 + 5 Step 3: Equals 7 What, if any, was Jane's mistake?

Jane's evaluation :

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