Alright, well just took GMAT Prep 1 after 3 months of studying and scored a 680 47Q 36V. I'm happy with the diagnostic score and I plan to take about 10 more tests in the next month before my real GMAT exam. I made a bunch of careless mistakes in quant but I seriously don't get a few of these. In particular 3,4,5. And I just want clarification for methods used on 1,2. 2: I suppose is zero because 2,2,5 cannot equal a triangle since 2+2<5.
1. In the arithmetic Sequence t1, t2, t3,...,tn,..., t1=23 and tn=tn-1 -3 for each n>1. What is the value of n when tn=-4?
A. -1
B. 7
C. 10
D. 14
E. 20
OA: C
2. If two sides of a triangle have lengths 2 and 5, which of the following could be the perimeter of triangle?
I. 9
II. 15
III. 19
A. None
B. I only
C. II only
D. II and III only
E. I, II, and III
OA: A
3. See attachment
OA: C
4. A thin piece of wire 40 meters long is cut into two pieces. One piece is used to form a circle with radius r, and the other is used to form a square. No wire is left over. Which of the following represents the total area, in square meters, of the circular and the square regions in terms of r?
A. (Pi)r^2
B. (Pi)r^2 + 10
C. (Pi)r^2 + (1/4)*(Pi)^2*(r^2)
D. (Pi)r^2 + (40 -2(Pi)r)^2
E. (Pi)r^2 + [10 - (1/2)*(Pi)*r]^2
OA: E
5. The sequence a1, a2, a3,...,a(n) of n integers is such that a(k)=k if k is odd and ak=-a(k-1) if k is even. Is the sum of the terms in the sequence positive?
(1) n is odd
(2) a(n) is positive
OA: D
1. In the arithmetic Sequence t1, t2, t3,...,tn,..., t1=23 and tn=tn-1 -3 for each n>1. What is the value of n when tn=-4?
A. -1
B. 7
C. 10
D. 14
E. 20
OA: C
2. If two sides of a triangle have lengths 2 and 5, which of the following could be the perimeter of triangle?
I. 9
II. 15
III. 19
A. None
B. I only
C. II only
D. II and III only
E. I, II, and III
OA: A
3. See attachment
OA: C
4. A thin piece of wire 40 meters long is cut into two pieces. One piece is used to form a circle with radius r, and the other is used to form a square. No wire is left over. Which of the following represents the total area, in square meters, of the circular and the square regions in terms of r?
A. (Pi)r^2
B. (Pi)r^2 + 10
C. (Pi)r^2 + (1/4)*(Pi)^2*(r^2)
D. (Pi)r^2 + (40 -2(Pi)r)^2
E. (Pi)r^2 + [10 - (1/2)*(Pi)*r]^2
OA: E
5. The sequence a1, a2, a3,...,a(n) of n integers is such that a(k)=k if k is odd and ak=-a(k-1) if k is even. Is the sum of the terms in the sequence positive?
(1) n is odd
(2) a(n) is positive
OA: D
