7.8 x 100 = 780
7.83 x 10,000 = 78,300
Answer:
- 20 seconds
- 70, 30, 20
Step-by-step explanation:
1. From the first floor to the 4th floor is a distance of 3 floors. From the first floor to the 16th floor is a distance of 15 floors, a distance that is 5 times as far as the first trip. We expect the second trip to take 5 times as long, or ...
(4 s) × 5 = 20 s
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2. The smallest and largest ratio number sum to 2+7=9. That sum exceeds twice the remaining ratio number by 9-2×3 = 3. Since this difference represents a difference of 30, each of the original numbers must be 30/3 = 10 times its corresponding ratio number.
The three numbers are 7×10 = 70, 3×10 = 30, and 2×10 = 20.
<em>Check</em>
(70 +20) -2×30 = 30 . . . true
3*3.14 as a rational number is 9.42. It would not be an irrational number, unless you are using 3.14 to represent pi, then it would be