Mathematics, 23.09.2020 01:01 karleygirl2870

Molly swimming in a pool that is 25 m long. She swim 24 length of the pool and 40 minutes. What was the rate of speed in meters per hour?
Can you please tell me how you got the answer thank you

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Answer from: arizmendiivan713

the length she swim = 24m

time taken = 40 minutes =40/60hour

rate of speed= 24/(40/60)= 36mper hour

Step-by-step explanation:

Answer from: lukeperry

Step-by-step explanation:

Because Molly swam across the pool 24 times, she swam a total of 24 * 25m = 600 meters.

600m in 40 minutes

Since 40 minutes * 1.5 = 60 minutes = 1 hour,

600m * 1.5 = 900m.

Hence Molly's speed was 900m/h.

Answer from: Quest

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify

Me it is my last question and i don’t want to get it wrong standard deviation

Answer from: Quest

your exact question is kind of difficult to understand, so maybe an example will explain what you're supposed to do? i'll work through the first problem on the worksheet.

suppose you have a tray of 652 brownies, and you have 5 friends that you want to feed without picking favorites. how many brownies can you dole out to each of your friends in equal amounts? how many will be left over for you to eat?

what you're doing here is finding a way to arrange the number 652 as the sum of integer multiple of 5 and some remainder: $652=5q+r$

here $q$ ("q" for quotient) is the number of brownies each of your friends get, and $r$ is the remainder. that's the basic idea behind division.

we break up the number 652 into parts so that the leading digit stands on its own:

652 = 600 + 52

first we check if it's possible to hand out exactly 100 brownies to each friend. with 5 friends, this means we want to know if we can take out 500 brownies from the tray. we can do this 1 time because we have 600 brownies to take from, and when we do that we're left with 100 + 52 brownies to divvy up. so we know that

652 = 1*500 + 152

next we want to know if it's possible to hand out exactly 10 brownies per friend. if we can, we have to remove 50 brownies from the tray each time until we can't. we have 152 brownies left, and we know that 3(50) = 150, so

152 = 3*50 + 2

now we have 2 brownies left in the tray. is it possible to hand 1 out to each of your 5 friends? no, you'd need a minimum of 5 brownies to do that. so the last 2 are yours.

putting everything together, we found that

652 = 1*500 + 3*50 + 2

and we can rearrange this to write

652 = 5*100 + 5*30 + 2

652 = 5(100 + 30) + 2

652 = 5*130 + 2

so $q=130$ and $r=2$ .

you might be more accustomed to the table depicting the algorithm. that's just a compact way of organizing what we've done above. you can consult the image i've attached below.

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Molly swimming in a pool that is 25 m long. She swim 24 length of the pool and 40 minutes. What was...

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