Bob is three times as old as mary. four years from now, bobwill be only twice as old as mary. find their present ages.

Rearrange the formula c^2 = a^2 + b^2 for b

Two lines parallel to the same plane are parallel to eachother

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?