If $A=\frac{1}{4}$ and $B=-\frac{1}{2}$, what is the absolute value of the difference between $18A$ and $18B$? Express your answer as a decimal to the nearest tenth.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If $A=\frac{1}{4}$ and $B=-\frac{1}{2}$, what is the absolute value of the difference between $18A$ and $18B$? Express your answer as a decimal to the nearest tenth.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
13.5
If $A=\frac{1}{4}$ and $B=-\frac{1}{2}$, what is the absolute value of the difference between $18A$ and $18B$? Express your answer as a decimal to the nearest tenth.
train