Answer:
-9
Step-by-step explanation:
you're taking away 7 each time, so -2-7=-9
The keyword is "sum" which tells you x, y, and z are being added. One half of the sum means that the sum of the three numbers is going to be divided by 2.
x + y + z
------------
2
90 divided by 2= 45 so x=45
2•45=90
So, for the next one y=60 because 90+90=180
3•60-2•45=90
Answer:
y-8+8
Step-by-step explanation:
