What is 10-(3×2^2-23)/(1+10^2)-2^2×5^2 in simplest form

Will give brainliest what is the value of x? enter your answer in the box.

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?

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.