Hi Mike. I had a question about question 10 on page 218 from your PWN 4th edition Math guide book. If percent means divide by 100, why is it 8 x10^-4 instead of 8 x 10^-8? I thought I had to divide 8 x 10^-6 by a 100. Could you clear this up for me?

# Hi Mike. I had a question about problem 3 on page 284 of your PWN 4th edition book.

Hi Mike. I had a question about problem 3 on page 284 of your PWN 4th edition book. I don’t understand how you can put values of a, b, c, or d on to the sides. How do you determine which side is which letter?

# I had a question about Example 7 on Page 270 in the PWN Math Guide book fourth edition.

I had a question about Example 7 on Page 270 in the PWN Math Guide book fourth edition. I don’t understand how sin (15) is equal to cos (5pi/12). Could you explain this ?

# I had a question about example 1 on page 245 in the PWN Math Guide fourth edition book.

I had a question about example 1 on page 245 in the PWN Math Guide fourth edition book. I thought the side AM is equal to 3√3 because of the 30-60-90 rule but according to the answer, AM is 4. I understand how it is 4 but how is it not 3√3?