Answer: 25 hours is the answer
Answer:
11
Step-by-step explanation:
30 - 2(7+2) -1
PEMDAS
Parentheses first
30 - 2(9) -1
Then multiply and divide
30 - 18 -1
Then add and subtract
12-1
1.39 × 10¹² or 1.39 × 10^12