Consider this option:
1. if to re-write the condition, it is given: total time t=8 hours; upstream=downstream=6 miles; V_boat=4 m/h., V_current=V=?
2. note, that total time=time_upstream+time_downstream, where time_upstream=6miles/(V_boat-V) and time_downstream=6miles/(V_boat+V). Using this it is possible to make up and solve the following equation:

answer: √10
P.S. the roots of the equation are √10 and (-√10), only positive values is needed for V.
Answer:
sure
Step-by-step explanation:
she multiplied it 3 times, so, i dont think 8 should be negative.
Boom. Answer. I hope I helped!
Answer:
842 Fahrenheit, 723.15 Kelvin
Step-by-step explanation:
(450C * 9/5) + 32 = 810 + 32 = 842 Fahrenheit
450C + 273.15 = 723.15 Kelvin