Harry reads that a particular element has an atom with a mass of 0. 000000000012 grams. What is the weight of the atom expressed in scientific notation? A. 1. 2 × 10-9 grams B. 1. 2 × 10-11 grams C. 1. 2 × 1011 grams D. 1. 2 × 1012 grams.

hope it you

step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2

idek

step-by-step explanation:

oof

step-by-step explanation:

6 adults and 9 children went.

a + c = 15

12a + 9c = 153

12(6) + 9(9) = 153

72 + 81 = 153