Arunner tries to keep a consistent stride length in a marathon. but, the length will change during the race. a runner has a strde length of 5 feet for the first half of the race and a stride length of 4.5 feet for the second half

1. 70,000 feet

2. 14,000 strides

3. About 15,555.55 strides

Step-by-step 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

first, we define the variables:

x: number of years after 1950

f (x): amount of vinyl sold.

then, with the variables defined, we have:

68594 vinyl records were sold in 1958 > f (8) = 68594

91299 vinyl records were sold in 1961 > f (11) = 91299

38720 vinyl records were sold in 1952 > f (2) = 38720

161743 vinyl records were sold in 1967 > f (17) = 161743

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step-by-step explanation: