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6 February, 06:45

Find the sum of the summation of 2 i minus 12, from i equals 7 to 16.

22

110

220

440

+2
Answers (1)
  1. 6 February, 08:23
    0
    Sum: S

    S=[2 (7) - 12]+[2 (8) - 12]+[2 (9) - 12]+[2 (10) - 12]+[2 (11) - 12]+[2 (12) - 12]+[2 (13) - 12]+[2 (14) - 12]+[2 (15) - 12]+[2 (16) - 12]

    S=2 (7+8+9+10+11+12+13+14+15+16) - 10 (12)

    S=2 (115) - 120

    S=230-120

    S=110

    Answer: Second option 110
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