What is the percent grade of a driveway that rises 18 feet over 190 feet?

To determine the percent grade of a driveway, you calculate the ratio of the vertical rise to the horizontal distance and then convert that ratio into a percentage. The formula for percent grade is:

[

\text{Percent Grade} = \left( \frac{\text{Vertical Rise}}{\text{Horizontal Run}} \right) \times 100

]

In this scenario, the vertical rise is 18 feet, and the horizontal run is 190 feet. Plugging these numbers into the formula gives:

[

\text{Percent Grade} = \left( \frac{18}{190} \right) \times 100

]

Calculating the fraction:

[

\frac{18}{190} \approx 0.0947368421

]

Next, multiplying by 100 to convert the decimal into a percentage:

[

0.0947368421 \times 100 \approx 9.47%

]

Rounding this to the nearest whole number gives approximately 9%. Therefore, the percent grade of the driveway is about 9%. This calculation aligns with the answer provided, confirming that it is correct based on the information given. Understanding how to apply the formula and perform the calculations is