Navigation around a distant planet failed after several glowing orbit beacons drifted out of position. Nova, Luna, and Emek found beacon labels marked -9, -4, 1, 6, and 10, but none were in the correct place. Using the orbital guide's number line, they compared each integer to zero and positioned every beacon from least to greatest. After checking that the negative beacons were left of zero and the positive beacons were right of zero, they restored the navigation system. Incoming spacecraft followed the rebuilt guide and reached the planet safely.
Challenges
Challenge 1 of 5
Challenges
Challenge 1 of 4
Hint
For negative integers, the number farther from zero on the left is smaller.
Emek says -4 should be placed to the left of -9 because 4 is less than 9. Which statement correctly checks his claim?
Emek is incorrect because -9 is less than -4, so -9 belongs farther left.Emek is correct because 4 is less than 9.Emek is correct because all negative integers have the same position.Emek is incorrect because both numbers belong to the right of zero.Correct! -9 is less than -4, so it belongs farther left.
Compare the positions of -9 and -4 on a number line, not just 9 and 4.
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Hint
Find both distances on the number line and add them.
An incoming spacecraft travels from beacon -4 to beacon 6, then from beacon 6 to beacon 10. How many units does it travel altogether?
Correct! The spacecraft travels 14 units altogether.
Find the distance from -4 to 6, then add the distance from 6 to 10.
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Hint
Check whether every integer increases from left to right.
Luna checks the rebuilt guide. Which arrangement contains a mistake?
-9, -4, 1, 6, 10-9, 1, -4, 6, 10-9 and -4 are left of zero.1, 6, and 10 are right of zero.Correct! In choice B, 1 is incorrectly placed before -4.
Look for the choice that does not match the correct number-line order.
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