The answer you put is wrong. It should be:
-17/30
Step 1
<span>Calculate the error
</span>error=75-64-----> 11 ft
step 2
<span>Divide the error by the exact value
</span>11/64=0.1719
step 3
<span>Convert that to a percentage
</span>0.1719*100=17.19%
the answer is
17.19%
We know that
scale factor=measure triangle DEF/measure triangle ABC
DE/AB=DF/AC=EF/BC
12/72=7/42=11/66-----> 1/6
the answer is
<span>the scale factor of ABC to DEF</span> is 1/6
4 (1/5 ) = 21/5
21 / 5 divided by 2 / 3 equals
21 / 5 * 3 / 2 equals 63 / 10 equals
6 (3 / 10)