√z = 13 - 8
√z = 5
z = 5²
z = 25
In this case the z can be any number, however z cannot be less than 0 and that is the restriction. (for example; √-1 = irrational number, cannot be solved.)
Answer: look at the picture i attached!
Answer:
Time=
years
Step-by-step explanation:
Let total time
Initial Amount
Final Amount
Total interest = Final Amount - Initial Amount

Simple Interest 