Final answer:
The equation that represents the charge remaining in Parker's battery t hours after he left his house is B = 20 - 4t, where B is the battery charge percentage.
Step-by-step explanation:
When Parker left his house, his cell phone was at 20% charge. To find the charge remaining in the battery after t hours, we use the formula:
B = 20 - 4t
Here, B represents the battery charge as a percentage, and t represents the time in hours since Parker left his house. Each hour, the phone loses 4% charge, which is reflected by the –4t term in the equation.
The Complete Question is:
When Parker left his house this morning, his cell phone was 20% charged and it then started to lose 4% charge for each hour thereafter. Write an equation for B, commaB, in terms of t, commat, representing the charge remaining in Parker's battery, as a percentage, tt hours after Parker left his house.