Q: What is the sum of 8 9?

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18 and 1

17

The answer is -32 Sum of -16+8 = -8 Half of -8 = -4 Sum of -5+9 = 4 Twice of 4 = 8 Product = 8*(-4) = -32

20 = 3 + 8 + 9

It is: 2(9+8) = 34

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8+y is the sum of 8 and y

The sum of 1 + 8 is 9.

The sum of 8, 11 and 9 is 28.

18 and 1

17

The answer is -32 Sum of -16+8 = -8 Half of -8 = -4 Sum of -5+9 = 4 Twice of 4 = 8 Product = 8*(-4) = -32

There is no sequence of adds or subtracts of 5, 6, 8, 9, and 10 that sum to 1. Check it with this C++ code... for (int i=0; i<32; ++i) { int sum = 0; if (i&1) sum += 5; else sum -= 5; if (i&2) sum += 6; else sum -= 6; if (i&4) sum += 8; else sum -= 8; if (i&8) sum += 9; else sum -= 9; if (i&16) sum += 10; else sum -= 10; cout << i << " " << sum << endl; }

8 + 1 equals 9

20 = 3 + 8 + 9

It is: 2(9+8) = 34

8 and 1 8+1=9 8*1=8

1 + 8 = 9