Evans dog weighs 7 times as much as oxana dog. together the dogs weigh 72 pounds. how much does evan dog weigh

How is this equation completed? i cannot find any examples in the book.

Will mark ! (10 points also! ) if x varies inversely with y and x =6 when equals y= 10, find y when x=8 a. y=4.8 b. y=7.5 c. y=40/3 d. y=4/15

Arace is 10 kilometers long.markers will be placed at the beginning and end of the race course and at each 500 meter mark.how many markers are needed to mark the course for the race?