Jodie ran at an average speed of 9 km/h for 40 minutes. How far did she run in km?

2 answers:

8 0

Answer: 6km

Explanation:
By using the formula d=v x t
And knowing:
V=9km/h
t= 40 min = 2/3hr
We get an equation:
d= 9 x 2/3 = 6km

sdas [7]4 years ago

7 0

Answer:

6 km

Step-by-step explanation:

40 min = 40/60 h = 4/6 h = 2/3 h

1 h ................. 9 km

2/3 h ..............x km

x = 2/3×9km = 18/3 km = 6 km

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Effectus [21]

$-2|8-x|-6=-12 \ \ \ |\hbox{add 6} \\
-2|8-x|=-6 \ \ \ |\hbox{divide by (-2)} \\
|8-x|=3 \\
8-x=-3 \ \lor \ 8-x=3 \\
-x=-3-8 \ \lor \ -x=3-8 \\
-x=-11 \ \lor \ -x=-5 \\
x=11 \ \lor \ x=5 \\
\boxed{x=5 \hbox{ or } x=11}$

It should be x=11 instead of x=-11, so he is not correct because he made a sign error.

6 0

3 years ago

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gavmur [86]

Answer:

0.125 seconds.

Step-by-step explanation:

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We can see that our given equation is a downward opening parabola as its leading coefficient is negative. The maximum point will be vertex of parabola.

To find the time, when the ball would be at its maximum height, we need to find the x-coordinate of vertex.

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