Answer:
1. Gained 9 kilos =
![+9](https://img.qammunity.org/2022/formulas/mathematics/high-school/wafzhm272t5zp28fyukadryfmryr8c1m88.png)
2. 32 steps backward =
![-32](https://img.qammunity.org/2022/formulas/mathematics/high-school/grctbzw1o8d2oj2e2tltiwusc834nnrrco.png)
3. Decreased by P5 =
![-P5](https://img.qammunity.org/2022/formulas/mathematics/high-school/hwqi4he4jspu775xbknaqqgc45sozob4n0.png)
Explanation:
Natural numbers refer to numbers that are used for counting.
Whole numbers include 0 and natural numbers.
An integer is a collection of whole numbers and their negatives.
1. Gained 9 kilos =
![+9](https://img.qammunity.org/2022/formulas/mathematics/high-school/wafzhm272t5zp28fyukadryfmryr8c1m88.png)
(Gained is denoted by + )
2. 32 steps backward =
![-32](https://img.qammunity.org/2022/formulas/mathematics/high-school/grctbzw1o8d2oj2e2tltiwusc834nnrrco.png)
(backward is denoted by - )
3. Decreased by P5 =
![-P5](https://img.qammunity.org/2022/formulas/mathematics/high-school/hwqi4he4jspu775xbknaqqgc45sozob4n0.png)
(decrease is denoted by - )