question_answer

Subtract:

(a) \[35(20);\]

(b) \[72(90);\]

(c) \[(15);(18);\]

(d) \[\text{(}\,20)(13);\]

(e) \[23-(12);\]

(f) \[(32)-(40)\]

Answer:

(a) 35 - (20)

= 35 + (additive inverse of 20)

= 35 + (- 20)

= 15

(b) 72 - (90)

= 72 + (additive inverse of 90)

= 72 + (- 90) = - 18

(c) (- 15) - (- 18)

(a) = (- 15) + (additive inverse of - 18)

(b) = (- 15) + (+ 18)

(c) = 3

(d) (- 20) - (13)

= (- 20) + (additive inverse of 13)

= (- 20) + (- 13)

= - 33

(e) 23 - (- 12)

= + 23 + (additive inverse of - 12)

= 23 + 12

= 35

(f) (- 32) - (- 40)

= (- 32) + (additive inverse of - 40)

= (- 32 + 40)

= 8