12. Each day, Yumiko exercises by first doing sit-ups and then running. Make a scatter plot of the total time she exercises as a function of the distance she runs. Draw a trend line. Distance: 2, 2.5, 3, 3.5, 4
Time: 23, 28, 34, 34, 40

Given:

Distance:   2      2.5    3    3.5    4

Time:        23      28    34   34   40

To find:

The scatter plot of the total time she exercises as a function of the distance she runs.

Solution:

Let y be the total time she exercise if she cover the distance x units..

From the given table, the ordered pairs are (2,23), (2.5,28), (3,34), (3.5,34) and (4,40).

Plot these points on a coordinate plane to get the scatter plot.

Now, the general equation of trend line is

where, a is slope and b is y-intercept.

Using graphing calculator, we get the trend line and value of slope and y-intercept.

The equation of trend line is

Therefore, the scatter plot of the total time she exercises as a function of the distance she runs is shown below and the equation of trend line is .

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.