" the sum " means add
the sum of 8 and a number...
8 + n <== ur expression
Answer: 7.2
Step-by-step explanation:

20000 x 90/100 = 18000
18000 x 90/100 = 16200
The value of the car after 2 years is $16200
Answer:
1/8, 2/8
1/8+2/8= 3/8
0/8<3/8<4/8
Step-by-step explanation: