Using our context clues, the theory of a central fire most likely means: that the center of the earth was made of fire that if one is going to build a fire, it should be centrally located that a fire must exist in the center of all thing that fire explodes eventually

Which of the following is the result of expanding

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?

Out of $20$ creepy-crawly creatures in a room, $80\%$ are flies and $20\%$ are spiders. if $s\%$ of the total legs belong to spiders, what is $s$?