what is 10 - 8 + 6 - 4 + . . . + ( - 10 ) ?
"the expression considers all even numbers between 10 and - 10 with alternate addition and subtraction of the numbers . the numbers to be used are : 10 , 8 , 6 , 4 , 2 , 0 , - 2 , - 4 , - 6 , - 8 , and - 10 now , the first term is positive and the next term is subtracted . so , the required expression becomes , 10 - 8 + 6 - 4 + 2 - 0 + ( - 2 ) - ( - 4 ) + ( - 6 ) - ( - 8 ) + ( - 10 ) = 10 - 8 + 6 - 4 + 2 - 0 - 2 + 4 - 6 + 8 - 10 = 30 - 30 = 0 hence the correct answer choice is a ."
subtract(6, 8)