Plutonium-238 has a yearly decay constant of 7.9 x 109. if an original same
inal sample has a mass of 15 grams, how long will it take to decay to 12 grams
(a = apok
oa 3 years
ob. 12.3 years
oc. 28 3 years
od. 139.1 years

christopher is 272,195 year old

step-by-step explanation:

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a

answer: 40392

step-by-step explanation:

10098 x 4 = 40392

f . i can go whenever i feel like it bc it is confidential meaning only i would know how much i deposited besides the bank and they wouldnt care bc when you make a deposit you are using their services which means they are using there competition and gaining more customers

and if they dont well then thats less customers for them in a less profitable way

plz mark brainliest