Answer:
Part 1)
----> The y-intercept is the point (0,5), graph initially decreases rapidly and then decreases slowly
Part 2)
----> The y-intercept is the point (0,1), graph initially decreases rapidly and then decreases slowly
Part 3)
----> The y-intercept is the point (0,1),graph initially increases slowly and then increases rapidly
Step-by-step explanation:
Part 1) we have

Find the y-intercept
Remember that the y-intercept is the value of y when the value of x is equal to zero (initial value)
For x=0
Substitute

The y-intercept is the point (0,5)
using a graphing tool
see the attached figure N 1
The graph initially decreases rapidly and then decreases slowly
Part 2) we have

Find the y-intercept
Remember that the y-intercept is the value of y when the value of x is equal to zero (initial value)
For x=0
Substitute

The y-intercept is the point (0,1)
using a graphing tool
see the attached figure N 2
The graph initially decreases rapidly and then decreases slowly
Part 3) we have

Find the y-intercept
Remember that the y-intercept is the value of y when the value of x is equal to zero (initial value)
For x=0
Substitute

The y-intercept is the point (0,1)
using a graphing tool
see the attached figure N 3
The graph initially increases slowly and then increases rapidly