Which answer describes the restrictions for the variables?

x - 4 / x + 1

Math each whole number with a rational, exponential expression

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?

Evaluate the expression. (9 + 5)(3 + 2)0