A 100g sample of Carbon-14 has a half-life of 5 years. How much Carbon-14 is left after 10 years?

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Carbon 14 has a half life of 5730 years. After 17,190 years 1/8 of the carbon 14 in a sample will be left. If 5 grams of carbon 14 are left after 17190 years, how much was in the original sample? THIS IS A 6TH GRADE MATH QUESTION, PEOPLE! PLEASE NO ADVANCE CHEMISTRY AND OTHER CONSIDERATIONS,

Explanation:

linda: 3 ; laura: 15

step-by-step explanation:

note that linda + laura's age is 18, and that linda is 12 years younger than her sister.

let "linda" = x , "laura" = y:

x + y = 18

x = y - 12

first, plug in y - 12 for x in the first equation:

(y - 12) + y = 18

simplify.

2y - 12 = 18

isolate the variable (y). note the equal sign, what you do to one side, you do to the other. do the opposite of pemdas. first add, then divide.

2y - 12 (+12) = 18 (+12)

2y = 18 + 12

2y = 30

(2y)/2 = (30)/2

y = 30/2

y = 15

next, plug in 15 for y in the second equation (the other equation would work too).

x = y - 12

x = (15) - 12

x = 3

linda's age is 3, laura's age is 15.

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where are the choice options?