Answer:
1. x - 1
2. 
Step-by-step explanation:


Answer:
AC = 30
Step-by-step explanation:
Start with:

Combine like terms.

Subtract
from both sides of the equation.

Subtract
from both sides of the equation.

Then, substitute
for
in 

Multiply.

Finally, add.

Oof this one is hard I think it’s 20 mm but I’m not sure
Use x as the base variable. All others as x+(extra amount).