The value of a certain stock tripled. if you knew what the stock used to be worth, how would you find how much it is worth now?

You would multiply what the stock used to be worth by 3 to get the answer. The answer is what the stock is worth now

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