Sam drives his car at a constant speed. he travels a distance (d) of 15 miles with 12 of a gallon of gas (g). write an equation in the form of d=rg that represents the relationship between distance (d) and the number of gallons of gas (g), where r is the constant of proportionality.

Step-by-step explanation:

Sam drives his car at a constant speed. He travels a distance (d) of 15 miles with 1/2 of a gallon of gas (g)

Distance d= 15

Gallons of gas (g)= 1/2

Equation is d= rg

Now plug in the values

15 = r* 1/2

Now we divide by 1/2 on both sides

r=30

Now we replace the value of 'r' in the equation d=rg

b.-4 units

all you   do is count how many times you move