In a laboratory the weight of a certain plant is measured every day. The weight on the first day was 2 g and on the following days were 6 g, 18 g and 54g.
How can we express the weight of the plant on the nth day?
A. 2 x 3^n g
B. 3 x 2^n-1 g
C. 3^n -1g
D. 2 x 3^n-1 go

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais

Simplify (2^5/3^2)^4 a. 2^20/3^8 b. 2^9/3^8 c. 8^5/12^2 d. 2/3^2

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi