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ivann1987 [24]
3 years ago
11

Two workers, a trainer and a trainee, working together can do a job in 3 hours. The trainer is 3 times faster than the trainee t

o complete the same job. How long will it take the trainee to finish the same job?
Mathematics
1 answer:
Flauer [41]3 years ago
4 0

Answer:

4 hours

Step-by-step explanation:

Ratio of working together

Job : number of hours

1 : 3 = 1/3

Trainer

Job : number of hours

1 : x = 1/x

Trainee

Job : number of hours

1 : 3x = 1/3x

1/x + 1/3x = 1/3

Multiply through by 3x

3x(1/x) + 3x(1/3x) = 3x(1/3)

3 + 1 = x

4 = x

x = 4 hours

It takes the trainee 4 hours to finish the job

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Can I have some help here
Ganezh [65]

Answer:

the answer of that question is Letter C

3 0
3 years ago
Suppose you have a box with 3 blue marbles, 2 red marbles, and 4 yellow marbles. You are going to pull out one marble, record it
prohojiy [21]

The probability of randomly getting first a red marble and then a blue marble is:

P = 0.083

<h3>How to find the probability?</h3>

There are:

  • 3 blue marbles
  • 2 red marbles
  • 4 yellow marbles.

For a total of 9 marbles.

The probability of getting a red marble is equal to the quotient between the number of red marbles and the total, so:

P(red) = 2/9

Then the probability of getting a blue marble is equal to the quotient between the number of blue marbles and the total, but because we already took one marble, now the total is 8.

P(blue) = 3/8

The joint probability is given by the product:

P = (2/9)*(3/8) = 0.083

If you want to learn more about probability:

brainly.com/question/25870256

#SPJ1

7 0
2 years ago
Write the following numbers used in these statements in scientific notation. (Note: Some of these numbers have been rounded.)
kodGreya [7K]
That would be 1.785 x 10^-4
6 0
3 years ago
What is the leading coefficient of the polynomial function? <br><br> y=-x^4+4x^2
attashe74 [19]
<h3>Answer:  -1</h3>

Explanation:

The given equation is the same as y = -1x^4+4x^2

The leading term is the term with the largest exponent, so it's -1x^4

The leading coefficient is the coefficient of the leading term.

In short, we circle the first coefficient we see. This is assuming that the polynomial is in standard form where the exponents decrease when going from left to right.

6 0
2 years ago
9. Courtney rolled a number cube 76 times. The number two appeared 24
gulaghasi [49]

Answer:

\frac{6}{19}

Step-by-step explanation:

Experimental probability is based on what has happened already.

Theoretical probability is what should happen.

Example, a coin has 2 sides:

head or tail

The theoretical probability of flipping a head in a flip is:

1/2

But say, an experiment had a coin flipped 10 times and it came 6 heads and 4 tails, the probability of head would then be:

6/10 = 3/5

A bit different than the theoretical one because it is the experimental probability.

Now, back to our question -----

76 times rolled (76 trials total)

2 appeared "24" times (24)

<u>P(rolling a two) = 24/76 = 6/19</u>

THis is the experimental probability of the experiment of 76 trials.

4 0
3 years ago
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