1621 . যদি xy < 0, xz > 0 and z < 0 হয়, তবে নিচের কোনটি অবশ্যই সত্য হবে?
- A. y > 0
- B. Y < 0
- C. yz > 0
- D. কোনোটিই নয়
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1623 . Points A, B, X, and Y are on a straight line, but not necessarily in that order. Given the lengths AB=12, BX=2, and XY=8, what is the length AY?
- A. 12
- B. 6
- C. 18
- D. cannot be determined
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1624 . If xy>0 and x<0, which of the following must be negative?
- A. -x
- B. y
- C. -y
- D. (x-y)
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1625 . If x = y = 2z and xyz = 256 then what is the value of x?
- A. 12
- B. 8
- C. 16
- D. 6
- E. None of them
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1626 . If x = 2y =3z and xyz =36 , what is the value of z?
- A. 2
- B. root 2
- C. root 3
- D. 3
- E. None of them
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1627 . (x,y)-এর মান কত, যখন- 2x+3y=7, 5x-2y=8
- A. (2, 1)
- B. (1, 2)
- C. (3, 1)
- D. (1, 3)
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1628 . 3x+2y=7 এবং 2x=y হলে (x,y) হবে-
- A. (2, 1)
- B. (3, 1)
- C. (1, 2)
- D. (-1, -2)
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1630 . If xy>0 and yz<0, which of the following must be negative?
- A. xyz
- B. xyz2
- C. zy2z
- D. xy2z2
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1632 . If x-y=2 and xy=80. What is the value of x3-y3?
- A. 520
- B. 488
- C. 380
- D. 466
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1633 . যদি (x-y)2=14 এবং xy=2 হলে x2+y2=কত?
- A. ১২
- B. ১৪
- C. ১৬
- D. ১৮
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