On the first swing, a pendulum swings through an arc of length 100 cm. On each successive swing, the length of the arc is 80% of the length of the previous
swing.
a. Write a rule to model this situation.
b. Find the length of the arc on the fourth swing. Round your answer to the
nearest cm.

Step-by-step explanation:

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square

step-by-step explanation: