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3 years ago

Round 7.66 to the nearest 10 grams

Mathematics

1 answer:

den301095 [7]3 years ago

6 0

10 grams. If it was less than 5 you would round it to 0, if it was 5 of more, you would round it up to 10

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Lisa earns $2.50 a week and lives in a state that taxes and come at 5%. How much does Lisa pay in state tax each week?

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Answer:

Step-by-step explanation:

Weekly tax that Lisa pay is 5% of her weekly earning at $2.50

= 5/100× $2.50=$0.125

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3 years ago

Next door to me lives a man with his son. They both work in the same factory. I watch them going to work through my window. The

kirza4 [7]

9514 1404 393

Answer:

k = 5

Step-by-step explanation:

Suppose the distance to the factory is 1 unit. Then the speed the father walks is ...

speed = distance/time = 1 / 30 . . . . units per minute

When the father leaves 10 minutes earlier than the son, his position t minutes after the son starts walking is ...

d = 1/30(t +10)

Similarly, when the father starts 5 minutes earlier than the son, his position t minutes after the son starts walking is ...

d = (1/30)(t +5)

We want that to be the same as the distance the son covers t minutes after he starts walking. The son's progress is ...

d = 1/20t

To find the value of k such that the distance covered is the same 2k minutes after the son starts, we will use t=2k and d=d, so ...

(1/30)(2k +5) = (1/20)(2k)

4k +10 = 6k . . . . . multiply by 60

10 = 2k . . . . . . . . . subtract 4k

5 = k . . . . . . . . . . . divide by 2

The attached graph shows the different scenarios, where the blue line is the son's progress. When the father starts 5 minutes earlier, the son meets him half-way to the factory after 10 minutes, so k = 10/2 = 5.

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2 years ago