Michelle is on a road trip with her family and forgot her charger. At the start of the trip, her phone was at 100%. They are driving from Dallas to San Antonio which is a 4.5-hour drive. Her phone's battery life can be represented by y = - 10x + 100, where x is hours driving. What is the range of this situation?

55 ≤ x ≤100

Step-by-step explanation:

Given the battery life equation: y = - 10x + 100 where x is hours driving

As we know that the maximum value of y = 100% when x = 0

y ≤100

They are driving from Dallas to San Antonio which is a 4.5-hour drive.

=> x = 4.5 so we substitute x into the equation, we have:

y = - 10*4.5 + 100

y = - 45 + 100 = 55

Hence, the range of this situation is:

55 ≤ x ≤100

Hope it will find you well.