We have the following:

solving for x

The solution of x is equal to 28, therefore 12 is not a solution of the equation
Those number are all powers of 10
10= 10^1
100= 10^2
1000= 10^3
and so on...
Answer:b.activity-based costing.
Step-by-step explanation: Activity-based costing is a costing system that first talkies or identifies the activities that are involved in the Manufacturing or in a particular process and them assigns cost to such activities. This type of costing gives high premium or focus on the activities as it assigns cost to products based on the activities that led to the production of the products.
THIS TYPE OF COSTING IS ALSO KNOWN AS ABC APPROACH TO COSTING IT FIRST ASSIGN RESOURCES TO ACTIVITIES AND FROM ACTIVITIES TO PRODUCTS BASED ON THE CONSUMPTION ESTIMATES.
As a improper fraction, its 127/100
Value of the boat after 9 years= 12050*(1-0.12)^9
=$3814(correct to nearest integer)