Substract by 12 from 42, and keep going down until you hit -54, which is 8 hours!
Answer:
None of those options
Step-by-step explanation:
I just did the work myself and even ran it through a calculator but the correct answer isn't one of those options. Here's my work:

I'd contact you teacher about that...it might be an error in their system (it's happened to me a few times before where the correct answer is marked as incorrect or isn't even an option)
There are 30 students in the classroom; 40% are men and 60% are women. How many men and women are in the classroom?
40/100 = 2/5 60/100 = 3/5 30 ÷ 5 = 6 3 × 6 = 18 so 18 are women 2 × 6 = 12
so there are 12 men.
Answer:
12,922
Step-by-step explanation:
estimate = 16,092 * 803/1,000 = 12,922
Factors of 35:
1 and 35
5 and 7
Bad break for you, you're going to have to find some other way to factor your quadratic equation. Try the quadratic formula.