Ineed with starting the equation or getting the answer

The costs per year U(x) and S(x) when x represents the number of fitness classes attended:

1) U(x) = 250 + 3.5 * x

2) S(x) = 400 + 2 * x

3) Set the costs of both gyms to be equal and solve for x:

U(x) = S(x)

250 + 3.5 * x = 400 + 2 * x

1.5 * x = 150

x = 100

The costs for both fitness gyms are the same when you attend 100 classes. The costs are:

U(100) = 250 + 3.5 * 100 = 250 + 350 = 600

S(100) = 400 + 2 * 100 = 400 + 200 = 600

Both gyms will cost $600 if you attend 100 classes.

only 10/60 isn't equivalent

hope this : )

12cm

the answer is d