Final answer:
To calculate the equation of a parabola using a calculator, enter the data into the calculator and create a scatter plot. Then, use the calculator's regression function to find the equation of the least-squares regression line. This equation represents the best-fit line for the data.
Step-by-step explanation:
The equation of a parabola can be calculated using data entered into a calculator or computer. First, the data should be entered into the calculator to create a scatter plot. Then, the calculator's regression function can be used to find the equation of the least-squares regression line, which represents the best-fit line for the data. This equation is typically in the form y = ax + bx², where the coefficients a and b can be determined by the calculator.