Question

a) The temperature of a place falls by 7°C, then rises by 15°C and again falls by
9°C. What will be the final temperature, if the initial temperature was 28°C?
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Answer 1

Answer:

Here certain words like "falls", "rises" are used.

"falls" means coming down or reducing. Thus, we can use the "-" symbol for this.

"rises" means coming up or increasing. Thus, we can use "+" for this.\

Initial temperature=28°C.

The temperature falls by 7°C, then rises by 15°C and again falls by  9°C.

Thus, final temperature=28-7+15-9

=27°C.

Thus, final temperature was 27°C.

HOPE THIS HELPS :D