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4.The rectangular rug shown in the figure above has a floral border 1 foot wide on all sides. What is the area, in square feet, of that portion of the rug that excludes the border?7 S( t$ E1 p6 M) I6 D
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A.28
+ Y9 I/ g2 v0 ], a7 g0 n/ k B.40& z6 L/ i3 |1 o% g+ t' V9 l+ g
C.457 ?3 o4 M3 A5 Q
D.48
3 W, Z C* Y" Z E.53
7 Y& i/ G' H! f7 p6 \% w* {( h8 u 答案：A6 T: D, u6 ?0 n+ ` K$ O2 ]5 t
5. The diagram represents a rectangular garden. The shaded regions are planted in flowers, and the unshaded region is a walk 2 feet wide. All angles are right angles.% l1 s' l, z/ j8 e( a0 s }) _
 + V b. S. x( U4 k7 H; }. c; ~. x
The sum of the areas of the shaded regions
. A' A+ D; ?) j- R9 x( U( Y 2,800 square feet2 `1 K' |( [/ v* |5 L6 }
答案：D
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6.What are the coordinates of point B in the xy-plane above?
2 @3 w2 c, Q0 V# C* a1 {# H # c& @; T% y) ?+ i
A.(6,12). O0 ]/ N$ M4 A7 U1 ]
B.(6,28), `) S1 i3 ?6 Y, u( A0 K
C.(8,20)! b3 D& [- J$ t4 Z7 x l
D.(12,20)
; H9 o) b7 X& W! T0 K5 \ E.(14,28)5 ~, j$ z8 m# d
答案：B! l+ H& k5 W" S2 Y* U) \
7.If 9 trees are originally planted in a circular pattern as shown above, what is the least number of trees that must be transplanted so that the 9 trees will be in 2 straight rows?
6 V" ]4 E0 V5 @% ]% q
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B.5
/ X ~# |4 V8 q6 Y' p$ e v C.6
. V [6 l5 J& k! U1 w! \' Z D.7) X7 R) N; x. m- O% G5 w# i
E.89 O' u4 S8 Z+ p! U9 L* R
% T: P5 ?) G0 k2 {6 p4 V 答案：B |
发表于 2012-8-15 12:55:17
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