Okay okay okay
Answer:
r = 
Step-by-step explanation:
12 -
= 5
6 × 12 × r × 6 -
= 5 × 6
72r - r = 30
71r = 30
r = 30 ÷ 71
r = 
Okay and... what are you confused about
The answer is 12
Step 1. Perform the operations inside the parenthesis:
(4 + 9) − 3(6) ÷ 2 + 8 = 13 - 18 ÷ 2 + 8
Step 2. Division has advantage over subtraction and addition:
13 - 18 ÷ 2 + 8 = 13 - 9 + 8
Step 3. Subtract and add:
13 - 9 + 8 = 12
A) d= [0,9]
b) r= [0, 125]
hope this helps!