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nikdorinn [45]
3 years ago
13

Helpppp with question 8

Mathematics
1 answer:
koban [17]3 years ago
3 0

Answer:

y - 8

Step-by-step explanation:

She is 8 years younger so you'd subtract eight from her sister's age.

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lorasvet [3.4K]

Daniela made her error on step 3 because it says:

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She didn't find the difference between the today and last week means. She just put the mean as a whole.

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3 years ago
A hose with a larger diameter working alone can fill a swimming pool in 9 hours.A hose with a smaller diameter working alone can
Arte-miy333 [17]

The large hose fills 1 pool in 9 hours written as  1/9

The small hose fills 1 pool in 18 hours, written as 1/18


Now you have 1/9 + 1/18 = 1/x ( x is the unknown time for both hoses).

rewrite 1/9 with a common denominator as 1/18:

1/9 = 2/18


Now you have 2/18 + 1/18 = 1/x

Add the left side:

2/18 + 1/18 = 3/18


Now you have 3/18 = 1/x

Cross Multiply:

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x = 18/3

X = 6


It will take both hoses 6 hours.

8 0
3 years ago
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grigory [225]

Answer:

40 mph

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If the speed increased by 20%, now the speed is 120% of the original speed.

48 mph is 120%, so dividing by 6 will get 8 which is 20%.

If 8 is 20%, you can multiply it by 5 to get 40, which is 100%. This means 40 mph is the original speed.

Hope this helps!

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The answer is below hope it helps.

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