Need help ASAP! the problem is attached as a picture!

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2

Josie buys a pair of boots that retail for $52.00 dollars, however they are currently on sale for 25% off how much does josie pay for the boots if there is also a 6% sales tax on them

Whoever gets this right gets the ! the half life of a soul smelling substance is 4 years. if you have 8 oz of this strange substance, how much of it will you have after 20 years? show work.