The answer is 500. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.
500 - 399 = 101
797
1168
1812
Alice found 812-413=399 she added 812+399 to check her work. What did she do wrong?
(21)3 -(19)3 (21)2+(19)2+(399)
9 + 101 = 110
a + 101 = 14.2 therefore, a = 14.2 - 101 a = -86.8
the answer to 100+1 is 101
78 + 23 = 101
-101 + 1 = -100
The Apple iPhone 6 plus will cost $399 with a contract.