Question 4 of 33intermediate🔧 ApplyNumerical4 marks
Evaluate these expressions by thinking of them as the resulting movement of combining button presses: a. (+1) + (+4) = _____ b. (+4) + (+1) = _____ c. (+4) + (−3) + (−2) = _____ d. (−1) + (+2) + (−3) = _____
(a)
Answer
+5
(b)
Answer
+5
(c)
Answer
−1
(d)
Answer
−2
Explanation
(a) Pressing +1 then +4 is the same as pressing +5, reaching Floor +5. (b) Pressing +4 then +1 is the same as pressing +5, reaching Floor +5. (c) From +4, go down 3 floors to +1, then go down 2 more floors to −1. (d) From −1, go up 2 floors to +1, then go down 3 floors to −2.