The area is the l*w , does that help?
In a parallelogram, opposite angles are congruent.
This means that the four angles of the parallelogram are:

Moreover, the sum of the interior angles of a polygon with n sides is 180(n-2). So, the sum of the interior angles of a parallelogram is 360.
This means

And since
, we have 
8.235 X 10 -4exponent. The exponent is negative because you moved the decimal to the right instead of left :) hope this helps!
Circumference= 2πr
Circumference= perimeter
14.28km= 2(3.14)r
14.28= 6.2831853072r
divide both sides by 6.2831853072
2.27= r
ANSWER: The radius is 2.27km
Hope this helps! :)
Answer:
a. 64 x ($)8 = ($)512
b. 45 (members) / 9(weeks) = 5 (members per week)