50 point first grab up

The distance d that a car can travel in a certain amount of time t can be found by multiplying the rate of speed r by the travel time. if a car has already travel 4 miles, the formula for the total distance travel is d= rt + 4. which of the following gives the value of r, in terms of d and t?

If (a, b) is the solution to the system of equations shown above, and a and b are integers, then what is the value of a+b?

If you measure your shoe size would it be considered qualitative data?