Subtract $-48$ from the sum of $-34$ and $-49$.

A bird watcher on a cliff spotted a kingfisher $7 \mathrm{m}$ above him. Earlier he had seen it $11 \mathrm{m}$ below him. What was the change in altitude of the kingfisher?

For morning walk, Amrita goes $8 \mathrm{km}$ due south from her home and then from there $10 \mathrm{km}$ due north in first round. If the end point of first round is the starting point of second round and so on, how far and where will she be from her home after $5$ rounds?

Minimum temperature on Wednesday was ${30}^{\mathrm{o}}\mathrm{C}$. On Thursday, minimum temperature fell by $4^{\mathrm{o}}\mathrm{C}$. Rainfall on Friday caused the minimum temperature to fall further by $7^{\mathrm{o}}\mathrm{C}$. What was the minimum temperature on Friday?