11) The half-life of carbon-14 is 5730 years. How much of a 400g sample will remain after 12,000 years? A) 93.677 grams B) 345.953 grams C) 287.288 grams D) 9.368 grams​

20days louise can read300 pg

step-by-step explanation:

1 day 15 pg 300: 15= 20

x day 300 pg

if y=4x then you will substitute 4x in for y in the second equation.

8x + 4x = 18 combine like terms

12x = 18 divide by 12 on both sides

x = 18/12 or 3/2

now replace x in the first equation with 3/2 to get

y = 4 3/2

y = 6

the answer is a

(3/2,6)

hope that .

brainliest is always apprectiated

6+6=12 so that just tells you what it is one half is 6 the next one is 6