Figure 1
The horizontal axis of the line graph is labeled “Age in d” and the vertical axis is labeled “Compressive strength in megapascals.” The vertical axis ranges from 30 to 70 in increments of 5. The horizontal axis ranges from 0 to 112 with markings at 28, 56, 84, and 112. There are three data points marked with an “x” at (28, 55), (56, 59.5), and (90, 64.5). A logarithmic trend line passes through the data points. The equation “y equals 8.2063 natural log of (x) plus 26.898” and “R squared equals 0.9871” are displayed next to the line on the graph. The graph is enclosed in a rectangular border.Strength–age relationship curve of core specimens. Source(s): Author’s own work