MTH 120 — Summer — 2005
Essex County College — Division of Mathematics
Quiz # 31— Printed May 16, 2005
Name:
Signature:
Show all work clearly and in order, and box your final answers. Justify your answers algebraically
whenever possible. You have 20 minutes to take this 10 point quiz. When you do use your
calculator, sketch all relevant graphs and write down all relevant mathematics.
1. Find the numerical coefficient of the term whose variable part is x6y3in the expansion of
(x−2y)9
.
Solution:9
6(x)6(−2y)3= 84 ·(−8) x6y3=−672x6y3
So, the numerical coefficient is −672 .
2. Convert each of the following angle measures to radian measure.
(a) 60◦=
Solution:
60◦= 60◦
·π
180◦=π
3
(b) 90◦=
Solution:
90◦= 90◦
·π
180◦=π
2
(c) 50◦=Solution:
50◦= 50◦
·π
180◦=5π
18
1This document was prepared by Ron Bannon using L
A
T
E
X 2ε.
1