What is the degree of x 6 + 4x – 3?

For how answer my question this will be the last question can you answer in math subject

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

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. how many hours after the truck's departure will the two meet?