Element X decays radioactively with a half life of 14 minutes. If there are 920 grams of Element X, how long, to the nearest tenth of a minute, would it take the element to
decay to 10 grams?
y= a(.5)

Para o de lá de novo a gente

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post