Please help me please answer it correctly if it’s correct I will mark you brainliest

The probability is 3/10

Step-by-step explanation:

Step 1:  Find the probability

ballroom dance / total dancers

6/20

Step 2:  Simplify

(6/2) / (20/2)

3/10

 The probability is 3/10

C

Step-by-step explanation:

The formula we use to solve this would be:  

Where

T is the period in seconds

is the wavelength in m, and

v is the speed of the wave in m/s

We have equal to 100, and v = 200 m/s. Plugging these into the equation, we get the period:

C is the right answer.