If you earned 8,425 in one year how much money would you owe if the government enforces 15%

Ican figure out 20 shares multiply by $117.98 =2359.6920 shares multiply by $124.32=2486.40then take 40 shares multiply by $128.48=5139.20after that i'm lost any be greatly appreciated.

What value of x is in the solution set of 4x - 12 s 16 + 8x? -10 -9 -8 -7

The functions below show the amount of money bella and sweet t had saved after earning money for doing chores. which description best compares the two functions?