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6 + 9 = 15 Six plus nine equals fifteen.

It is: 6 plus 9 = 15

(-9) + (-6) = -15

It is: 6 plus 9 = 15

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Q: What is the sum of -9 and -6?

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3 and 9 Difference: 9-3=6 Sum: 9+3=12

6+9= 15

9

Sum = 42 Count = 6 Mean = Sum/Count = 42/6 = 7

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; }

9

9

It is: 3+6 = 9

It is: 6+9 = 15

The sum of 9 and -6 is 3.

3 and 6

The number is 54. The sum of its digits is 5 + 4 = 9. 54/9 = 6.