I would suggest asking your teacher for help that seems like a lot... :(
Answer:
D
Step-by-step explanation:
Exponential decay occurs when the base is less than 1 but greater than 0.
3/2 = 1.5 and is greater than 1.
-3/2 is not greater than 0 and is not exponential
-2/3 is not greater than 0 and is not exponential
2/3 is less than 1 and greater than 0. This is decay.
Addition property of equality
If you have to write the equation then it would be "5k + 6.7"