Which shows a graph of a liner equation in standard form ax+by=c, where a=0, b is positive, and c is negative

What is the square root of 45? (step by step working plz)

Which equation represents the function on the graph?

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?