Find the sum of the sequence.
39 +40 +41 +42 + ... + 138
1 answer:
Answer:
Sol1 you can use "first(first+last)/2" is 138(138+1)/2 - 38(38+1)/2 = 8850
Sol2 or you can look this 39+40+41+....+100+(100+1)+(100+2)+....+(100+38) = 1+2+3+.....+99+100+100(38) = 5050+3800 =8850
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Step-by-step explanation:
Answer:
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Step-by-step explanation:
9) 9x+25=13x+19 13x-19+17y+5=180
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Answer:
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Step-by-step explanation:
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