Is this example an Expression or Equation?
3(x + 6) - 4y
A. Expression
B. Constant
C. Equation
D. Variable

I WILL GIVE 50 POINTS IF YOU HELP ME SOLVE THIS PLS HELP

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

Use circumcenter theorem to solve for the given values

What is the effect on the graph of the function f(x) = x2 when f(x) is changed to f(x) − 4?