Answer:
B. 
Step-by-step explanation:
Given:

Hence Solving the given expression we get;
By Law of Indices which states;

Hence we get;

Also We know that

So,

Answer:x+12
Step-by-step explanation:
The answer is:
(2x+9)(2x-9)
160 - Percentage decrease =
160 - (2% × 160) =
160 - 2% × 160 =
(1 - 2%) × 160 =
(100% - 2%) × 160 =
98% × 160 =
98 ÷ 100 × 160 =
98 × 160 ÷ 100 =
15,680 ÷ 100 =
156.8