Answer:


Step-by-step explanation:
Given
See attachment for triangles
Solving (a)

The tan of an angle is:

From the given triangle.


So, we have:

Solving (b)

The cos of an angle is:

From the given triangle.


So, we have:

It would be the girls because 7 divided into 21 equally is 3. So there will be 7 groups of 3 girls.
Answer:
Step-by-step explanation:
Hello,
Please, see the attached file.
Thanks.