Write out each expression with numbers first.
3). (1 point each) Evaluate these expressions for: d = +8 e = +4 f = - 2:

a). d/e = _______

. 		b). de = _______

. 		c). f + d = _______

. 		d). f + d - e = _______

.
e). 4e + 3d = _______

. 		f). 8d - 9e = _______

. 		g). f + e = _______

. 		h). 8de = _______

.
i). 5ed = _______ j). e/d = _______ k). f + 2e = _______ l). d9/e = _______

4). (1 point each) Evaluate these expressions for: a = 1/2 b = 1/4 c = 1/3
a). a + b = ______

.		 b). ab = ______

.		 c). a - b = ______

.
d). abc = ______

.		 e). ac = ______ f). 2a = ______
5). (3 points) [Extra credit]
Beth has saved 3 1/2 books of trading stamps. How many more books of stamps does Beth need to get a backpack and frame that cost 6 3/4 books?

Answer: ____________

6). (3 points) [Extra credit]

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.

find 2 two-digit prime numbers whose digits sum to 7.       Answer: ________ and ________