I need help answering the following question:

A road sign reads: "5% grade next 4 miles." What is the change in elevation from the lookout to the point four miles ahead (to the nearest foot)?

5% * 4mi = .2mi = 1056 ft

7a-4(b 2)for a =5 and b=2"?

what if Ali only had tens and ones? How could she have modeled 624 without using hundreds?

To calculate the change in elevation, we need to understand what is meant by a "5% grade." The term "grade" is commonly used to describe the slope or incline of a road or surface. In this case, a 5% grade means that for every 100 units of horizontal distance traveled, there is a 5 unit increase in vertical distance.

Here's how we can determine the change in elevation step-by-step:

1. Convert the 5% grade to a decimal: divide 5 by 100, which gives us 0.05.

2. Determine the vertical distance for a 1-mile segment: since we know that for every 100 units of horizontal distance there is a 5 unit change in vertical distance, we can calculate that for each 1-mile segment there is a 0.05 x 5280 feet increase in elevation. This gives us 264 feet.

3. Calculate the change in elevation for 4 miles: since we want to find the change in elevation for a 4-mile segment, we multiply the vertical distance for a 1-mile segment by 4. Thus, the change in elevation from the lookout to the point four miles ahead is 264 feet x 4 = 1056 feet.

Therefore, the change in elevation from the lookout to the point four miles ahead is 1056 feet.