Answer:
1. 70,000 feet
2. 14,000 strides
3. About 15,555.55 strides
Explanation:
Complete Question:
A runner tries to keep a consistent stride length in a marathon. But, the length will change during the race. A runner has a stride length of 5 feet for the first half of the race and a stride length of 4.5 feet for the second half.
1.)A marathon is 26 miles 385 yards long. That is about 1.4 × 105 feet. How many feet long is half a marathon?
2.)How many strides would it take to finish the first half of the marathon?
3.)How many strides would it take to finish the second half of the marathon?
1.
1.4 * 10^5 is in scientific notation. To get the number, we move the decimal place 5 units to the right. So the number is:
140,000 feet
So, half a marathon is half of that which is
140,000 / 2 = 70,000 feet
2.
Each stride is 5 feet and first half is around 70,000 feet.
Hence,
Number of strides = 70,000/5 = 14,000 strides
3.
Here, each stride would be 4.5 feet and second half is about 70,000 feet.
Hence,
Number of strides = 70,000/4.5 = About 15,555.55 strides