Answer:
20 yrs old
Step-by-step explanation:
The first one (1)
1 2
3 4
The numbers on the graph (just numbered them for better understanding)
10
substitute the given values into the expression
2(x + z) - y
= 2(6 + 3) - 8
= 2(9) - 8
= 18 - 8
= 10