11. a contestant on the biggest loser lost 15% of their
body weight in the first month. the contestant began
the month weighing 291.4 pounds. what was the
contestant's weight at the end of the first month?

247.69

Step-by-step explanation:

To find 10% you divide 291.4 by 10 and get 29.14, to find 5 percent you divide 29.14 by 2 and get 14.57. then you add the 29.14 and 14.57 just like u add 10% and 5%. and get 43.71, then you subtract 291.4 by 43.71 and get 247.69.

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