Question

Which sums are equal to -9+21? Choose

all the correct answers.
A 21 +(-9)
B 9+(-21)
C (-9) + 9 + 12
D -(9 + 21)
E (-9) + (-21)

Answer 1

A, C

Explanation:

Answer 2

A and C

Explanation:

-9 + 21 = 12

Option A:

21 + (-9)

21 - 9

12 TRUE

Option B:

9 + (-21)

9 - 21

-12 FALSE

Option C:

(-9) + 9 + 12

0 + 12

12 TRUE

Option D:

-(9 + 21)

-(30)

-30 FALSE

Option E:

(-9) + (-21)

-9 - 21

-30 FALSE

Best of Luck!