Hello i need some help on part a and part b of my hw

Step-by-step explanation:

(a)

The domain of a function denotes the upper and lower limits of the x co-ordinate values, over which the function is defined.

Here, the x co-ordinates over which the function is defined are from -9 to 7.

Hence ,the domain is: -9 ≤ x ≤ 7

(b)

The range of a function denotes the upper and lower limits of the y co-ordinate values, which the function gives.

Here, the y co-ordinates over which the function gives are from -6 to 4.

Hence ,the domain is: -6 ≤ y ≤ 4

28

step-by-step explanation:

8+8+6+6

i think it would be 42cm