Assuming the question is about four eighths and not four eight, 9/16 + 4/8 = 9/16 + 8/16 = 17/16.
The sum of (eight and nine tenths) plus (nine and eight tenths) is (eighteen and seven tenths). 8.9 + 9.8 = 18.7
The sum of four and negative eight is negative four.
The sum of four and five is nine.
25.
4N + 8
There is nothing in the description you have given which tells us the amount of that unspecified number, therefore, the answer could be anything. If you want to solve for an unknown number you need an equation. You might have said four times a number added to -9 subtracted from triple the sum of nine times the number and eight is equal to zero. Then we can solve the equation.
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The answer is 27.6. The sum is 8+12.1+6.6+.9
3/16
The numbers are four and nine.
6+4+8+2=20.
15 feet 7 inches.