What is your question exactly??
B. 4.
You can get this by setting them equal to each other and getting all of the x terms to one side. Then get the number values to the other and divide the coefficient away.
Answer:

Step-by-step explanation:
we know that


Let
x ------> new battery life
The equation that represent this situation is

convert to mixed number

Re-upload the photo you posted because it isnt showing up :(
The answer to this question is B: <span>y = 30/x. I hoped I have helped you today!</span>