Answer:
I think 15
Step-by-step explanation:
Because there are 3 in every 20 and 20 goes into 100 5 times and 5×3=15
Answer:
2540
Step-by-step explanation:
25% is a quarter of 100% so if 635 is 25% you multiple 635 x 4 to get your final answer concluding in 2540. if i'm wrong let someone else correct me :b
Answer:

Step-by-step explanation:
Given 
1. Find the difference 

This complex number has real part
and imaginary part 
2. The modulus of complex number z is
