Integers are not closed under

The product of three integers is -85. If the two numbers are -17 and -5, find the third number.

In a class test, +4 marks were awarded for the correct answers and -1 mark for the wrong answers. Student scores 40 marks. If his correct answers were 11, find his wrong answers.

-1 x -1 x -1 x ......... x-1 (99 times)

Product of any non zero integer and its additive inverse is always

The minimum temperature in Stanthorpe was -5⁰C. On the same day in Cairns the minimum temperature was 17⁰C.

Calculate the temperature difference.