Yes, it is.
797
1168
1812
Alice found 812-413=399 she added 812+399 to check her work. What did she do wrong?
Let the two consecutive negative odd integers be ( x ) and ( x + 2 ). The equation for their product is ( x(x + 2) = 399 ). This simplifies to ( x^2 + 2x - 399 = 0 ). Solving this quadratic equation, we find that the integers are ( -19 ) and ( -17 ), since ( -19 \times -17 = 399 ).
(21)3 -(19)3 (21)2+(19)2+(399)
The Apple iPhone 6 plus will cost $399 with a contract.
399*1 = 399. So 399 is divisible by 399. 399*2 = 798. So 798 is divisible by 399. 399*3 =1197. So 1197 is divisible by 399. 399*4 = 1596. So 1596 is divisible by 399.
57/8 = 399/56 17/7 = 136/56 399 + 136 = 535/56 = 9 and 31/56
8621
10.25% of 399= 10.25% * 399= 0.1025 * 399= 40.8975 (40.90)
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.