Algebra 1: Common Core (15th Edition)

The formula for area is l*w=A The given measurement is to the nearest 0.5 meters. That means that the greatest possible error is 0.25 meters $A=(18.5)(7.5)$ $A=138.75$ $A=(18.5)(7.25)$ $A=132.3125$ $A=(18.75)(7.75)$ $A=145.3125$ $|132.3125-138.75|$ absolute value to find the difference in the area between the minimum area and the measured area $6.4375$ $|145.3125-138.75|$absolute value to find the difference in the area between the maximum area and the measured area $6.5625$ $\frac{6.5625}{138.75}\approx0.05$, or 5% greatest possible percent error=greatest diference in area/measured area