7 hours
explanation:
30>or equal to 3h+9
subtract non on both sides:
21>or =to 3h
divide by 3:
7>or=to h
There are 60 minutes in a hour, 24 hours I'm a day, so 24 multiplied by 60 is 1,440, then multiplied by 365, the days in a year, getting 525,600 burgers in a year, divide 1 billion by that number, rounding that up gets 1,903 years
U) x=10, y=0. R) x=-7, y=-4. Hope this helps!!
-7c+9=c+1 (subtract c on both sides)
-8c+9=1 (subtract 9 on both sides)
-8c=-8 (divide by -8 on both sides to get c by its self)
c=1
your answer is 1.