Step 1. Substitute y for f(x)
Step 2. Switch x and y.
Step 3. Solve for y.
Step 4. Substitute f(x) for y.
X = number of cds on the rack
x + 7 = 30
x = 30 - 7
x = 23 <== so there are currently 23 cds on the rack
Answer: 
Step-by-step explanation:
the conjugate is:

Answer:
x = -9, -2, and 3.
just set everything possible to 0.
since 0 = 0 it must be true.