2. The result of a number minus -2 is 5. Find the number.
3. Rocky went 9 floors up by a lift to the 6th floor. Which floor did he start going up?
4.The temperture of a city was -10 yesterday morning.
(a) At noon, the temperture of the city went up by 6℃. Find the temperture of the city at noon.
(b) In the evening,the temperture of the city was -12℃. Comparing with the temperture at noon, find the change in temperture.
5.A submarine moves 50m up from 100m below the sea level, and then moves80m down. Express the final location of the submarine in a directed number.
6.One day, Kevin forget to bring his wallet. In the morning, he borrowed $12 from Vivian for breakfast. In the afternoon, he borrowed $22 from her again for lunch. If Kevin returned $20 to Vivian $20 the next day, how much was he still owing Vivian?
更新1:
要列式..plz 吾該= =