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3 years ago

11

one pump can empty the pool in 5 days, whereas a second pump can empty the pool in 7 days. how long it will take the two pumps,

working together, to empty the pool?

1 answer:

PtichkaEL [24]3 years ago

7 0

4 days jfjdhsbsiegebehehebeihrhe

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Help ! solve the following system of equations <br><br> -9x+2y=-13<br><br> 2x-9y=20

Stella [2.4K]

Answer: x = 1, y = -2

Step-by-step explanation:

-9x+2y=-13

x= 13/9 + 2/9y

2x-9y=20

2(13/9+2/9y)-9y=20

<em>Substitute y with -2.</em>

<em />

x= 13/9+2/9(-2)

<em>After solving you'll see that 1 is a possible solution for x.</em>

<em />

Check your answer

-9x+2y=-13

-9x1+2(-2) = -13

2x-9y=20

2x1-9(-2) = 20

-13 = -13

20 = 20

Therefore, x=1 and y=-2

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2 years ago

What is the measurement of m<1

klio [65]

Check the picture below.

7 0

2 years ago

aliya0001 [1]

Ik this is late, but people who are looking for the answer can see this.

Answer:

an =1/3*6^n-1

Step-by-step explanation:

You should plug in 2 for n in each equation, which, the correct one should give you 2. Then, to make sure, you plug in 3 in the equations that gave you 2.

Example:

an = 1/3 * 6 ^n-1

Plug in 2.

an = 1/3 * 6 ^2-1

an = 1/3 * 6 ^1

1/3 * 6 = 2

Step 2.

an = 1/3 * 6 ^3-1

an = 1/3 * 6 ^2

1/3 * 36 = 12

Hope this helps.

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3 years ago

You work 3:30pm-9:00pm. you take a break from 6:00 to 6:30. How many hours do you work in a day

lina2011 [118]

Answer:

You would work 5 hours a day

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2 years ago

Do the results support or contradict the common belief that the mean body temperature is 98.6degreesF? A. The results contradic

nata0808 [166]

Answer:

A. The results contradict the belief that the mean body temperature is 98.6 °F because both the mean and the median are less than 98.6 °F.

Step-by-step explanation:

Assume the temperature data were those in the table below.

You would have calculated that

Mean = 97.9 °F

Median = 97.9 °F

These observations contradict the belief that the mean body temperature is 98.6 °F.

A 2017 study found the mean oral temperature of more than 35 000 British patients was 97.9 °F.

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3 years ago