Question 3 (1 point) Saved Evaluate the expression: (3 + 4) * 5 Question 4 (1 point) Saved A symbolic name that is used in place of an actual memory address is called a(n) variable Question 5 (2 points) Saved State whether each of the following variables names is valid. For those that are invalid, give the reason why. a) $total b) a1b2c3 c) 4you d) tot.al a) not valid, because it contains and starts with a special symbol. at mnemonic