Answer:

1. independent and Dependent Variable:

  - Independent Variable: The independent variable is the input or the variable that you can control or change. In this scenario, the independent variable is the number of minutes you spend on the phone call.

  - Dependent Variable: The dependent variable is the output or the variable that changes in response to the independent variable. In this case, the dependent variable is the cost of the phone call, which depends on the number of minutes spent on the call.

2. Cost of Phone Call:

  - Cost for 1 minute: The initial charge is P5.00 for the first 3 minutes. So, for the first 3 minutes, the cost is P5.00.

  - Cost for 1 additional minute: The additional charge for every extra minute after the first 3 minutes is P2.00. Therefore, for each additional minute beyond 3 minutes, the cost increases by P2.00.

  To calculate the cost for a specific number of minutes:

  - For 3 minutes: The cost is P5.00 (initial charge).

  - For 4 minutes: Add P2.00 to the cost of 3 minutes.

  - For 5 minutes: Add another P2.00 to the cost of 4 minutes.

3. Equation for Calculating the Cost:

  The equation to calculate the cost of the phone call can be represented as:

Cost=Initial Charge+Additional Charge×(Number of Additional Minutes)

  - Initial Charge: P5.00 for the first 3 minutes.

  - Additional Charge: P2.00 for every additional minute beyond the first 3 minutes.

  - Number of Additional Minutes: The number of minutes beyond the initial 3 minutes.

  For example:

  - For 3 minutes: Cost = P5.00 (no additional minutes)

  - For 4 minutes: Cost = P5.00 (initial) + P2.00 (1 additional minute)

  - For 5 minutes: Cost = P5.00 (initial) + P2.00 (2 additional minutes)