1. simplify. 5–1(3–2)
a) 45
b) 1/45
c) 15^–3
d) 15^2 
2. simplify. mn^-4/p^0q^-2
a) mq^2/n^4
b) mp/n^4
c) mn^4q^2p^0
d) q^2/mn^4 
3. write in scientific notation. 0.0042
a) 42 × 10^2
b) 4.2 × 10^4
c) 4.2 × 10^3 
d). 42 × 10^4
4. write in standard notation. 6.12 × 10^3
a) 6,120 
b) 612
c) 61,200
d) 61.2
5. simplify. write in scientific notation. 0.5(8 × 10^5)
a) 8 × 5^5
b) 4 × 5^5
c) 8 × 10^5
d) 4 × 10^5 
6. simplify. write in scientific notation. (9 × 10^3)^2
a) 8.1 × 10^5
b) 81 × 10^4
c) 81 × 10^3
d) 8.1 × 10^6 
7. evaluate 1/2a^4b^2 for a = –2 and b = 4.
a) 2 
b) 1/2
c) 3
d) 4
8. is the following statement always, never, or sometimes true?
a number raised to a negative exponent is negative.
a) always
b) never
c) sometimes 
9. simplify (4xy^2)^3(xy)^5 (1 point)
a) 64x^8y^11
b) 64x^15y^30
c) 12x^2y^11
d) 12x^8y^11 
10. simplify (2t^3)^3(0.4r)^2 (1 point)
a) 3.2r^2
b) 1.28r^2/t^-6 
c) 1.28r^2/t^9
d) 0.8r^2/t^-6