It looks like you've uploaded an image of a worksheet covering the topic of the order of operations, commonly known as PEMDAS (Parentheses, Exponents, Multiplication and Division, Addition and Subtraction). Here’s a step-by-step breakdown of how to solve these problems:

Problems on the Worksheet:

1. 9 × 5 (20 ÷ 4 + 3)

   • Step 1: Evaluate inside the parentheses first:
     $20 ÷ 4 = 5$
     Thus, $9 × 5 (5 + 3)$.
   • Step 2: Add inside the parentheses:
     $5 + 3 = 8$
     So, $9 × 5 × 8$.
   • Step 3: Perform multiplication from left to right:
     $9 × 5 = 45$
     $45 × 8 = 360$.

2. 7 × (30 ÷ 5 + 9)

   • Step 1: Evaluate inside the parentheses first:
     $30 ÷ 5 = 6$
     $7 × (6 + 9)$.
   • Step 2: Add inside the parentheses:
     $6 + 9 = 15$
     So, $7 × 15$.
   • Step 3: Multiply:
     $7 × 15 = 105$.

3. (12 ÷ 3) + (4 × 6)

   • Step 1: Evaluate inside each set of parentheses:
     $12 ÷ 3 = 4$
     $4 × 6 = 24$.
   • Step 2: Add the results:
     $4 + 24 = 28$.

4. (17 + 9) ÷ 4

   • Step 1: Evaluate inside the parentheses:
     $17 + 9 = 26$.
   • Step 2: Divide:
     $26 ÷ 4 = 6.5$.

5. 49 ÷ (7 × 2) − 9

   • Step 1: Evaluate inside the parentheses:
     $7 × 2 = 14$.
   • Step 2: Divide:
     $49 ÷ 14 = 3.5$.
   • Step 3: Subtract:
     $3.5 − 9 = -5.5$.

6. 36 ÷ 6 + 8 − 4 × 3

   • Step 1: Perform