Add my answer to Exercise 2.74.

Included are the following 2 files:

	Exercise_2.74.pdf
	Exercise_2.74.tm

Thank you!
							Lawrence R. Amlord
							   Jul 28th, 2013
							   Xi'an, China
Add my answer to Exercise 2.75.

Included are the following 3 files:

	Exercise_2.75.pdf
	Exercise_2.75.scm
	Exercise_2.75.tm

Thank you!
							Lawrence R. Amlord
							   Jul 28th, 2013
							   Xi'an, China
Add my answer to Exercise 2.76.

Included are the following 2 files:

	Exercise_2.76.pdf
	Exercise_2.76.tm

Thank you!
							Lawrence R. Amlord
							   Jul 28th, 2013
							   Xi'an, China
Add code of Section 2.5.1.

Included is the following file:

	Generic_Arithmetic_Operations.scm

Thank you!
							Lawrence R. Amlord
							   Jul 28th, 2013
							   Xi'an, China
Add my answer to Exercise 2.77.

Included are the following 2 files:

	Exercise_2.77.pdf
	Exercise_2.77.tm

Thank you!
							Lawrence R. Amlord
							   Jul 28th, 2013
							   Xi'an, China
Add my answer to Exercise 2.78.

Included are the following 3 files:

	Exercise_2.78.pdf
	Exercise_2.78.scm
	Exercise_2.78.tm

Thank you!
							Lawrence R. Amlord
							   Jul 28th, 2013
							   Xi'an, China