Aliza needs to run at a rate faster than 8.8 feet per second in order to exceed her fastest time in a race. after running for 15 minutes, her coach determines that she is running at an average rate of 5.8 miles per hour. he converts the average rate to feet per second as shown below: he concludes that she is not running fast enough to exceed her fastest time. what errors did the coach make? check all that apply.

The rate at which she runs is referred to as speed. The need for Aliza to run  faster means she has to increase her speed from 8.8ft/s to a greater speed. Her coach's errors are:

Given that:

--- rate to beat

--- time

--- current rate per hour

The coach's conversion is as follows:

The first error is the hour to second conversion:

The conversion from hour to second is wrong because:

But he used

Another error the coach made is that:

The result of his conversion is 34.0ft/s; his conclusion should be that she is running fast enough because 34.0ft/s is greater than 8.8ft/s/

Hence, his second error is incorrect conclusion.

Read more about speed and rates at:

link

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m

d 25 pi/6

step-by-step explanation:

the diameter is 10 inches

the radius is 1/2 of the diameter or 5 inches

the area of the circle is

a = pi r^2

  = pi 5^2

  = 25 pi

the slice is 60 degrees of the entire circle.

60 degrees out of 360   60/360 = 1/6

the area of the slice is 1/6 of the circle

a slice = 1/6 a circle

a slice = 1/6 * 25 pi