Q1. 25 x (-99) can be written as 1) 25 x (100) + 25 x 1 2) 25 x (100) - 25 x 1 3) 25 x (-100) - 25 x 1 4) 25 x (-100) + 25 x 1 Solution Q2. (-5) x (-7) = 1) 36 2) -12 3) -35 4) 35 Solution As the product of two negative integers is a positive integer, we have (-5) x (-7) = 35 Q3. Simplify {-13 - (-27)} + {-25 - (-40)} Solution {-13 - (-27)} + {-25 - (-40)} = {-13 + 27} + {-25 + 40} = {14} + {15} = 14 + 15 = 29 Q4. A cooling machine requires that room temperature to be lowered from 50 o C at the rate of 5 o C every hour. What will be the ...