Answer:
3.6
Step-by-step explanation:
ok, Where x= total hours, the function is (2/5)-(1/9)x=total life
5ths and 9ths dont get along, so we must find a common denominator, in this case 45.
so now we have 18/45-5/45x=TL
or .4-.111...x=tl
By plugging in numbers, I got 3.6 hours of life
