Emek and Tara rode a maintenance car along a space elevator stretching above and below the zero-level station. An inspection report showed damage at platforms -18, 7, -11, 15, and -4, where each signed number described a platform's position relative to zero. They were currently at platform -18 and wanted to visit every damaged platform without unnecessary backtracking. Tara suggested arranging the platform numbers from least to greatest. They compared the negative positions carefully, noting that -18 was below -11, and -11 was below -4. The positive platforms came after zero, with 7 below 15. Their ordered route was -18, -11, -4, 7, 15. Emek checked the distances between consecutive stops: 7 levels, 7 levels, 11 levels, and 8 levels. Following the ordered route, they repaired each damaged platform while moving steadily upward. At platform 15, the final warning light disappeared, confirming that the space elevator was ready for service.

Challenges

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Challenge 1 of 5

Challenges

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Challenge 1 of 4
Hint
On a number line, compare which negative number is farther to the left of zero.
Emek is at platform -11 and Tara is at platform -4. Which statement correctly compares their positions?
-11 > -4 because 11 > 4-11 < -4 because -11 is farther below zero-11 = -4 because both platforms are below zero-4 < -11 because -4 is closer to zero
Correct. Platform -11 is below platform -4, so -11 < -4.
Remember that among negative numbers, the number farther below zero has the smaller value.
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Hint
Find the upward distance between each pair of consecutive platforms and add the distances.
Starting at platform -18, Emek and Tara travel upward through -11, -4, and 7 before reaching platform 15. How many levels do they travel altogether?
Correct. The total upward travel is 33 levels.
Check each change in platform number and then add all four distances.
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Hint
Compare -6 with the two nearby negative platform numbers, -11 and -4.
A new inspection warning appears at platform -6. To keep moving upward without backtracking, where should Emek and Tara place -6 in their route?
Between -18 and -11Between -4 and 7Between 7 and 15Between -11 and -4
Correct. Since -11 < -6 < -4, platform -6 belongs between -11 and -4.
Place -6 on a number line and compare it with -11 and -4.
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Uzay Asansörünü Onarmak
TR
ARC_G07_NUM_02_STORY_01
Uzay Asansörünü Onarmak
Repairing the Space Elevator
EN
ARC_G07_NUM_02_STORY_01
Repairing the Space Elevator