The answer to your question is 6.67.
Answer:
D.
Step-by-step explanation:
Answer:

Solving Steps
Use the quadratic formula

Multiply / Remove the parentheses / Evaluate

Calculate

Separate the solutions

Simplify

Step-by-step explanation:
The congruent angles of the isocels triangle's opposite sides's are congruent.
We are given the formula r = st. We evaluate each option to know the correct answer.
A.) S = r/t
r = st
B.) t = r/s
r = st
C.) s = t/r
r = t/s
<span>D.) r = ts
</span>r = st
Therefore, the correct answer among the choice given is option C. It is not equivalent to the formula.