Question 3 of 33intermediate🔧 ApplyShort Answer3 marks

Starting from different floors, find the movements required to reach Floor −5. For example, if I start at Floor +2, I must press −7 to reach Floor −5. The expression is (+2) + (−7) = −5. Find more such starting positions and the movements needed to reach Floor −5 and write the expressions.

Correct Answer

Some examples of expressions to reach Floor −5:

  • Starting at Floor +1: (+1) + (−6) = −5
  • Starting at Floor 0: 0 + (−5) = −5
  • Starting at Floor −1: (−1) + (−4) = −5
  • Starting at Floor −2: (−2) + (−3) = −5
  • Starting at Floor −3: (−3) + (−2) = −5
  • Starting at Floor −4: (−4) + (−1) = −5
  • Starting at Floor −6: (−6) + (+1) = −5
Exercise: Figure it Out (Section 1) | Q: 3 | (Page Page 4)
For More Understanding

Explanation

The chapter establishes that Target floor − Starting floor = Movement needed. To reach Floor −5 from any starting floor, we need to find the movement that makes the equation work. If starting at a higher floor, we need to go down (negative movement). If starting at a lower floor, we need to go up (positive movement).

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