During a 10-day period, the balance of martas chexking account dropped $290. write a division expression ro represent the change. then determine the average daily change in account balance during that 10-day period

I did x - 10 =290 
           +10   +10
           
             x = 300   so they took $1.00 a day

(1/x + 1)^2 + 6 (1/x + 1) +5

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