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melomori [17]
3 years ago
5

53.58 is 47 percent of what?

Mathematics
1 answer:
I am Lyosha [343]3 years ago
8 0

Answer:114

Sorry

Step-by-step explanation:

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It takes 12 hours for 7 men to paint a room.
dangina [55]

28 men are needed to paint the room in 3 hours

<h3><u>Solution:</u></h3>

Given that it takes 12 hours for 7 men to paint a room

We are asked to find number of men required to paint the room in 3 hours

Recognize, "paint the room" is 1 task. One job.

7 men -------- 12 hours ------ 1 job

(7/7) = 1 men ------- 12 x 7 (84)  ------- same 1 job

The one men is rate is 84 hours to do the job

We can express this as 1/84 jobs per hour, the one-person rate

Now lets find how many men needed to paint the room in 3 hours

Let the required number of men for 3 hours be "a"

The rates of each person is simply additive.

a \times \frac{1}{84} \times 3 = 1

corresponds to rate x hours = jobs and "a" is a variable for how many men

a \times \frac{1}{28} = 28

Thus 28 men are needed to paint the room in 3 hours

4 0
3 years ago
Multiply (5x^2 + x-4(x+2)
bagirrra123 [75]

Answer:

5x^2-3x-8

Step-by-step explanation:

So you will want this to be simplified.

expanding brackets is a great way of doing this

one you have expanded all brackets u get the answer above

:)

4 0
3 years ago
The roof of a house is the shape of an isosceles right triangles as shown in the diagram below. What is the height of the roof ,
matrenka [14]

What diagram? Where's the diagram?

6 0
3 years ago
Read 2 more answers
Please help! <br> what’s the value of x? <br> 8<br> 56<br> 12<br> 62
Katyanochek1 [597]
The value of x is 56
4 0
3 years ago
The finishing times, in minutes, for running marathons have an unknown distribution with mean 297 and standard deviation 32 minu
dangina [55]

Answer:

The mean for the sample mean distribution is 297 minutes.

Step-by-step explanation:

The Central Limit Theorem estabilishes that, for a random variable X, with mean \mu and standard deviation \sigma, a large sample size can be approximated to a normal distribution with mean \mu and standard deviation \frac{\sigma}{\sqrt{n}}.

Using the Central Limit Theorem for Means, what is the mean for the sample mean distribution?

The mean is the same as the population mean, that is, 297 minutes.

7 0
3 years ago
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