Answer:
a ≠ 2b
Step-by-step explanation:
The given expression is


Simplifying it, we have

For the above fraction to exist, the denominator must not be equal to zero.
i.e, a-2b ≠ 0
=> a≠2b
∴ The algebraic fraction exists when a≠2b.
Answer: He should have used the mean to determine the average because the data sets are approximately symmetric.
Step-by-step explanation

where A=final amount
P=principal
r=rate in decimal form
t=time in years
we are given that P=500, r=12%=0.12
we want to find A when t=10, 20, and 30
so


when t=10, 
when t=20, 
when t=30, 
Answer:
Step-by-step explanation:
B