Astudent is running a 5-kilometer race. he runs 1 kilometer every 3 minutes. select the function that describes his distance from the finish line after x minutes. f(x) = − 1/3x +5 f(x) = − 1/5x + 3 f(x) = 1/5x + 5 f(x) = 1/3x + 3 plz explain

A. f(x) = − 1/3x +5  

A student is running a 5-kilometer race, the total distance is 5 km.

He runs 1 kilometer every 3 minutes.  

So the speed will be,

Speed = Distance/time

Speed = 1/3

Speed is the rate of change or slope and as the total distance is decreasing with time so it will in negative, thus;

Slope = -1/3

So when on x axis time and y axis distance is represented, 5 will be the y intercept.

Then put all the values in slope intercept form of straight line,

y = mx + c

y = -1/3x + 5

y = 5 -1/3x

just take the area of the square and then the area of the circle then subtract the circle area from the squares area

step-by-step explanation: