10 different groups can ski.
This is a combination of 5 items taken 3 at a time:
Answer:
See below (I hope this helps!)
Step-by-step explanation:
We need to write this in the form y = mx + b.
x + 3y = -12
3y = -x - 12

<span>twice the sum of a number and seven is 8
2(x+7)=8</span>
It takes 3600 seconds for one hour. It takes 14400 seconds for four hours.
Hope I helped!