half the sum of the numbers s, t, and u
The sum of s, t, and u means we add all 3:
s + t + u
Half the sum means we divide the sum by 2:
(s + t + u)/2
The sum of s, t, and u means we add all 3:
s + t + u
Half the sum means we divide the sum by 2:
(s + t + u)/2