Step-by-step explanation:
Let 25% of x be 13

Hence, 25% of 52 is 13.
Answer:
3
Step-by-step explanation:
1. Write out the equation
2. Subtract 6 from each side
3. Divide by 4 on each side
Answer: (a)
Step-by-step explanation:
Given
angle is 
Sine and cosine at this angle is

Put the values in the identity 

The same thing is depicted by option (a)