Can someone help me with these?

What is the measure of ac? 5 units 13 units 26 units 39 units

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

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1