sat ii math questions!! (attention math wiz)

FxImpeccable
Sat, 29 Oct 2005 19:58:56 +0000

i had problems solving these questions (i either got em wrong or right but just not sure)

can anyone please explain how to solve the questions (briefly, as many as possible)

Problems from REAL SAT II (collegeboard)

If X0= 0 and Xn+1 = square root(6+Xn), then X3=
A) 2.449
B) 2.907
C) 2.984
D) 2.997
E) 3.162
The radius of the base of a right circular cone is 6 and the radius of a parallel cross section is 4. If the distance between the base and the cross section is 8, what is the height of the cone?
A) 11
B) 13.333
C) 16
D) 20
E) 24
Suppose the graph of f(x)=-x^2 is translated 3 units left and 1 unit up. If the resulting graph represents g(x), what is the value of g(-1.6)?
A) 2.96
B) -0.96
C) -1.56
D) -1.96
E) -2.56
In how many ways can 10 people be divided into two groups, one with 7 people and the other with 3 people?
A) 120
B) 210
C) 240
D) 5040
E) 14400
What is the length of the major axis of the ellipse whose equation is 60x^2 + 30y^2 = 150?
A) 1.26
B) 2.5
C) 3.16
D) 4.47
E) 5