1 Which statement is not always true about a parallelogram?

(1) The diagonals are congruent.
(2) The opposite sides are congruent.
(3) The opposite angles are congruent.
(4) The opposite sides are parallel.

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2 In isosceles triangle DOG, the measure of the vertex angle is three times the measure of one of the base angles. Which statement about ΔDOG is true?

(1) ΔDOG is a scalene triangle.
(2) ΔDOG is an acute triangle.
(3) ΔDOG is a right triangle.
(4) ΔDOG is an obtuse triangle.

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4 Factor completely: 3x2 - 27

(1) 3(x - 3)2         (3)3(x + 3)(x -3)
(2) 3(x2-27)         (4) (3x + 3)(x - 9)

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5 At a school costume party, seven girls wore masks and nine boys  did not. If there were 15 boys at the party and 20 students did not wear  masks, what was the total number of students at the party?

(1) 30      (3) 35
(2) 33      (4) 42

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