Leo looked at the graph. He traced the Y-axis up to 0.34. He slid his finger horizontally until it hit their perfect straight line, then dropped it straight down to the X-axis.
[ 0.415 = 0.831 \times \textConc + 0.001 ] [ \textConc = \frac0.415 - 0.0010.831 = 0.498 \text mg/mL ] glucose standard curve