The half-life of carbon-14 is approximately 5730 years. a) If we have 50 g carbon-14 today, how much is left in 50 years? (3 points)
b) If an artifact that originally contained 90 g of carbon-14 now contains 7 g of carbon-14,
how old is it?

i not know

step-by-step explanation:

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations:

70

step-by-step explanation: