Question

1. $6 + 4.5 \div 2 - 8 \cdot 1.5$
2. $x = -3$, $y = -7$, $z = $ (incomplete, but the expression is $2_x + 2_y + z + y$ with substitution steps: $-6 + -14 + 3 + -7$, $-13 -14 + 3$, $-27 + 3 = -24$ (partial steps shown))

Explanation:

Step1: Perform division and multiplication

First, calculate the division \( 4.5 \div 2 = 2.25 \) and the multiplication \( 8 \times 1.5 = 12 \).
The expression becomes \( 6 + 2.25 - 12 \).

Step2: Perform addition and subtraction

Next, add \( 6 + 2.25 = 8.25 \).
Then, subtract \( 8.25 - 12 = -3.75 \).

Answer:

\(-3.75\)