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1, 5, 9, 13, ? A. 15 B. 17 C. 19 D. 21 3, 6, 12, 24, ? A. 30 B. 36 C. 48 D. 54 Which of the following is not a prime number? A. 2 B. 3 C. 4 D. 5 If x = 5, then 2x + 3 = ? A. 10 B. 13 C. 15 D. 18 The sum of angles in a triangle is: A. 90° B. 180° C. 270° D. 360°

Mathematics

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  1. የሶስት ማዕዘን ውስጣዊ ማዕዘኖች ድምር 180∘180^\circ መሆኑን እንጠቀማለን።

    የተሰጡት ማዕዘኖች 35∘35^\circ, 40∘40^\circ እና x∘x^\circ ናቸው።

    35∘+40∘+x∘=180∘35^\circ + 40^\circ + x^\circ = 180^\circ

  2. የታወቁትን ማዕዘኖች አንድ ላይ እንደምር።

    75∘+x∘=180∘75^\circ + x^\circ = 180^\circ

  3. የ xx ዋጋን ለማግኘት ከ 180∘180^\circ ላይ 75∘75^\circ ን እንቀንሳለን።

    x∘=180∘−75∘x^\circ = 180^\circ - 75^\circ x∘=105∘x^\circ = 105^\circ

    ስለዚህ የ xx ዋጋ 105 ነው።

    ከቀረቡት አማራጮች ውስጥ ትክክለኛው መልስ B ነው።

    B. 105\boxed{\text{B. } 105}
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