Answer:
A.

B.

C. Height = 3.2 feet
D. Charges = $760
Explanation:
Given


Solving (a): Claire's 20ft charges
In this case, x = 20
Substitute 20 for x in





Solving (b): Richard's 15ft charges
In this case, x = 15
Substitute 20 for x in





Solving (c): Height which they both charge the same;
This implies that

Solving for x [Collect Like Terms\


Divide both sides by 10

Take square roots of both sides

(Approximated)
Hence; Height = 3.2 feet
Solving (d): How much they charge when the charge the same amount.
Substitute 3.2 for x in any of the given equation










The reason for the difference is due to approximation
Hence, they both charge approximately 760