Find the sum.
4/5r+10/3r

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

Which expression is equivalent to the expression shown?

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?