12h + 20t = income
1.5(h + t) + 7h + 9t + 500 = expenses
12h + 20t - 1.5(h + t) + 7h + 9t + 500 > 0
Start by dividing both sides by 2 to get

. Doing the math on the right, keeping in mind that logs have an unwritten base of 10, gives us

. Rewriting this in exponential form is

. That means that x = 8. Not negative, only positive.
Answer:
I really hope it will help you....
Step-by-step explanation:
Answer1-we can see that in last two hours the line is downwards so we can easily proof or see that at 11th and 12th are the temperature is lowest.
Answer2-in second one we can see that in hour 1,2,3,4 the temperature has kept on increasing.
Answer 3- between three or four temperature of increasing.