Question

battery b(d) equals percent d days after charge. \2 days after charge it was 50%\ is:
b(d) = 50
b(50) = 2
b(2) = 50
b(2) = d

Explanation:

Step1: Understand the function

The function \( B(d) \) represents the battery percentage \( d \) days after charge. So \( d \) is the number of days, and \( B(d) \) is the percentage.

Step2: Analyze the given situation

We are told that 2 days after charge (so \( d = 2 \)), the battery was 50% (so \( B(d)=50 \)). Substituting \( d = 2 \) into the function, we get \( B(2)=50 \).

Answer:

\( \boldsymbol{B(2) = 50} \) (corresponding to the option with \( B(2) = 50 \))