Company one cause the equation for it is y=0.04x. If you do y=0.04(500) u get 20$ as the total.
The volume of a sphere is 
So, if the small sphere has radius 
and the largest sphere has radius 
, their volumes are
So, their ratio is
It typically just needs two parts
1) all parties must be in agreement
2) something of value needs to be exchanged. ie. money, a service
The unit rate is -1/3.
In direct variation, y varies directly to x by a constant ratio k.
Its equation looks like this: y = kx ; where k stands for the constant ratio.
In the above equation. x = -3y, it should be converted to the proper equation. both sides must be transferred and its accompanying sign must be changed.
3y = -x
3y/3 = -x/3
y = (-1/3)x
where: y is the total value; -1/3 is the unit rate; and x is the number of units
