-- Type in formulas, plug in numbers and hit enter to see the result

time = distance/speed
speed = 50     -- mph
distance = 187 -- miles
time:3.740;    -- hours

-- Functions are similar but use parameters
tim(dist,spd) = dist/spd
tim(187,50):3.740

-- One reason to use functions is to allow using the same formula more than once in an expression

tim(187,50) + tim(70,30):6.073