h represents the number of hours: -13+5h=12 5h=12+13 (add 13 to both sides) 5h=25 h=25÷5 (divide both sides by 5) h=5 After 5 hours the temperature will be 12°F. If it was 4 a.m. 5 hours ago then now it's 9 a.m. (4+5=9) Hope this helped.
the answer would be at 9 a.m the temp. will be 12 degrees. how you would be able to solve this problem would add 5 more degrees for ever hour that passed.