Congratulations on the book but the formatting is very poor for a technical book. 10 words per line is good for a small paperback sized novel not for a technica

Congratulations on the book but the formatting is very poor for a technical book. 10 words per line is good for a small paperback sized novel not for a technical publication. The excessive white space, the line spacing are also inappropriate. The most important element (arguably) - the equation also is the hardest to read due to the small size and how compactly it was formatted. If you've paid for the formatting as a service I'd try to get a refund and give it to someone more competent.