6. Element Z has a mass of 430g. Scientists determined it to have a 12 life of 5 years. How many grams of element Z will remain after 15 years?

The correct answer is:   bri hope this answer was ! : )

They both go downwards and the can break apart rocks 

Answer is: value of q is 5·10⁻⁶m.chemical reaction: mg²⁺(aq) + co₃²⁻(aq) → mgco₃(s).c(mg²⁺) = 2.5·10⁻³ m; concentration of magnesium cations.c(co₃²⁻) = 2.00·10⁻³ m; concentration of carbonate anions.q = c(mg²⁺)  · c(co₃²⁻).q = 2.5·10⁻³ m  · 2.00·10⁻³ m.q = 5·10⁻⁶m.q = 0.000005 m.

C. 6.94 is the correct answer y'all