Answer: 
Step-by-step explanation:
Let be "C" the circumference of the circle (in feet) and "r" the radius of the circle (in feet).
Based on the information provided in the problem, you know that the circumference of the circle is always
as large as its radius.
Notice that this indicates a multiplication. Then, this means that the circumference of the circle is always equal to
by "r".
Based on this, you can write the following formula that expresses the circumference "C" in terms of the radius "r":

4 is 20% of 20. Hope this helps!
" the quotient " means divide
(x/3) - 4 <== ur expression
From the z-table and at p67 or 0.67 (the decimal values in the table),
Z =0.44
See the attached photo (at the point where 0.6700 appears)