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guapka [62]
3 years ago
15

Expression equivalent to (0.28t-0.3)-(0.7t-0.28)?

Mathematics
1 answer:
Softa [21]3 years ago
3 0
B because it obviously can’t be any other
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2 years ago
Javier worked the following hours in the month of October. What was the percent increase from week 2 to week 4?
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2005400sblackwell

2005400sblackwell

03/27/2020

Mathematics

Middle School

Javier worked the following hours in the month of October. What was the percent increase from week 2 to week 4?​

Answer:

32%

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I don’t know. I’m on a test got the answer wrong and it showed me the right answer.

7 0
3 years ago
A circular jogging track forms the edge of a circular lake that has a diameter of 2 miles. Johanna walked once around the track
harkovskaia [24]

Answer:

  C.  2.0 < t < 2.5

Step-by-step explanation:

  time = distance / speed

The circumference of the lake is given by ...

  C = πd = 2π miles ≈ 6.28 miles

Then Johanna's time is ...

  (6.28 mi)/(3 mi/h) ≈ 2.09 h

This time is in the interval (2, 2.5), so matches choice C.

___

<em>Alternate solution</em>

If we take pi to be 3, then this boils down to ...

  2×3/3 = 2 . . . hours

Pi is on the order of 5% more than 3, so her time will be on the order of 5% more than 2 hours, or just above 2, but not as great as 2.5 hours. This sort of estimating can get you to the correct answer without a calculator.

6 0
3 years ago
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