Answer:
3
Step-by-step explanation:
In order to have a perfect square you have to have at least two prime factors, and since three is quite clearly not in a pair, the answer is three.
no
because it doesn't work with the first equation
I=prt
I= 400×(4.5/100)×5
I=$90
total 400+90=$490
I=250×(2/100)×5
I=$25
total 250+25=$275