Your question is vague. There is not enough information. How many balls are in the box? 15 boxes would cost 109.80 thought.
Skier one will have more potential energy
Use completion of sq method
x^2+y^2+14x+10y-7=0
(x+7)^2+(y+5)^2=7+49+25
(x+7)^2+(y+5)^2=81
so centre is(-7,-5) radius is9
Answer:
or
Step-by-step explanation:
Given the following expression:

You can follow these steps in order to simplify it:
1. You need to apply Distributive property:

2. And now you must add the like terms. Then:

Therefore you get the following answer:
or
The LCD is 30. The fractions would be 9/30 and -8/30