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
Answer: 2
Step-by-step explanation:
By the geometric mean theorem,

D=y2-y1
D+y1= y2-y1+y1 add y1 to both sides to cancel it out.
D+y1=y2 that drops -y1 for the right side but the left remains.
And that's your answer.
Answer:
The sum of the digit of the product is 13
Step-by-step explanation:
Given

Solving (a): The product


Solving (b): The sum of the digits

