Question 1128518
f(x)=0.013x^2-1.19x+28.24 
f(x)=8
Therefore, 0.013x^2-1.19x+20.24=0
two solutions
x=(1/0.026)(1.19 +/- sqrt (1.19^2-4(20.24)(0.013)); sqrt (0.36362)=0.603
38.46*(1.793)=68.95 or 69
38.46*(.587)=22.57=23
(23, 69)
{{{graph(300,300,-10,80,-10,20,0.013x^2-1.19x+28.24,8)}}}