Point slope form problem

Find |−5|. a. −5 b. 5 c. one-fifth d. –one-fifth !

Describe the possible echelon forms of the standard matrix for a linear transformation t where t: set of real numbers is onto.

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?