Directed Numbers and Index Laws

(-6) + (-8) =

• 2

• 14

• -2

• -14

14 + (-9) =

• 5

• -23

• -5

• 23

2 + (-11) =

• 9

• -9

• 13

• -13

(-7) + 4 =

• 3

• -3

• -11

• 11

20 + (-5) =

• -15

• 15

• -25

• 25

• -108

• -72

• 72

• 108

• 9

• 7

• -7

• 9

• -14

• -12

• -4

• 14

• -15

• 11

• 15

• 29

A thermometer which initially reads -7⁰ C, the temperature dropped by 10⁰ C during the night, what will be the new thermometer reading.

• -17⁰ C

• -3⁰ C

• 3⁰ C

• 17⁰ C