Answer:
x = 1/2QN^2
Step-by-step explanation:
3
Mark brainliest please
Hope this helps you
X is the number
sum means add
sum of half a number and 4 means
(x/2)+4
result is -16
(x/2)+4=-16
minus 4 both sides
x/2=-20
times 2 both sides
x=-40
the number is -40