SAT Math help- practice PSAT from collegeboard

insomniac_01
Sat, 02 Aug 2008 15:38:13 +0000

How many different 3-digit positive integers can be formed using the digits 2,3,4,5,6,7,8 if the units digit is 2 and no digit is repeated within an integer.


A 12
B 15
C 24
D 30
E 36

The figure above shows a circle with radius r and center P and an arc of length 6. The radii shown are extended 3 units outside the circle. There is an arc of length x, which is part of a larger circle (not shown) also centered at P. what must x equal?


9
12
r+3
pie(r+3)/2
(6r+18)/r