What is the value of x PLEASE HELP

Solve the equation 3x2 + 19x + 9 = 0 to the nearest tenth.

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Adriana sold 50 shares of a company’s stock through a broker. the price per share on that day was $22.98. the broker charged her a 0.75% commission. what was adriana’s real return after deducting the broker’s commission? a. $8.62 b. $229.80 c. $1,140.38 d. $1,149.00