i have something to do its called Find the value of x in each right angle do you think you can help me ​

[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?

Sam is picking fruit from a basket that contains many different kinds of fruit. which set of events is independent?