Question

1. a function f has an input of -3 and an output of 5. write this in function notation.
2. the charge function takes in the amount of minutes a phone is charging and determines the percentage of the phone. what does charge(20) = 40 mean?

Explanation:

Step1: Recall function notation

Function notation is \(f(x)=y\), where \(x\) is the input and \(y\) is the output.

Step2: Substitute the given values

Given input \(x = - 3\) and output \(y = 5\) for function \(f\), we substitute into the function - notation formula.

In the function \(Charge(t)\), \(t\) represents the number of minutes the phone is charging (input) and \(Charge(t)\) represents the percentage of the phone's charge (output). When \(t = 20\) (20 minutes of charging) and \(Charge(20)=40\), it means that after 20 minutes of charging, the phone's battery is at 40% charge.

Answer:

\(f(-3)=5\)