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egoroff_w [7]
3 years ago
6

An electrician disconnected 5 wires of different colors from their respective connections and forgot the order in which they wer

e placed. Assuming you connect them by trying different sorts and that the last one is correct, how many tries must you do before getting it right?
Mathematics
1 answer:
Inessa05 [86]3 years ago
8 0

Answer:

120 tries

Step-by-step explanation:

You can try 5 different wires in the first connection.

Then you have 4 wires left, so you try 4 wires in the second connection. Remember, you are now trying 4 wires for each of the first 5, so up to here you already made 4 * 5 tries = 20 tries.

Next you try 3, then 2, then you have 1 left.

Number of tries: 5 * 4 * 3 * 2 * 1 = 120

Answer: 120 tries

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3 years ago
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Question 374756: Two trains leave the station at the same time, one heading east and the other west. The eastbound train travels
Dvinal [7]

Let the number of hours = X

Multiply the speed of each train by the number of hours (x) and add them together to equal the total miles:

75x + 95x = 238

Simplify:

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Divide both sides by 170:

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x = 1.4 hours.

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3 0
3 years ago
There are 27 pupils. There are twice as many boys than girls. how many boys and girls are there
Anna71 [15]
Let x  =  the numbers of girls
thus
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3 0
3 years ago
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Alright, here's one for Algebra:
Wewaii [24]
Let x= number rows
Then x + 5 = number of seats per row

x(x+5) = 126
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3 0
3 years ago
Mei Mei invested $1700 in an account that pays 3% interest compounded annually.
algol [13]

Answer:

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4 0
2 years ago
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