Answer:
1. A: the size of its last meal
B: Giraffe's hunger
2. A: amount of time spent landscaping.
B: Total earnings
C: y=20x.
3. A: the number of staplers he buys.
B: input: number of staplers bought. output: total cost.
C: y=16.99x
D: You multiply 16.99 by 15
4. A: $125
B: input: the number of visits output: total cost
