Solving lineal inequalities: 0.24y-0.64> 3.86 please help

The volume of a cube is 8 in to the 3rd power. how long is each side?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?