Question

Find the sum:
-21 + (-13) + (-9).

Answer 1

Any ideas?

Answer 2

A\[a+(-b)=a-b\]

Answer 3

???

Answer 4

for any numbers,\[a+(-b)=a-b\]apply this here.

Answer 5

Since you are adding all negative numbers, add them as if they were all positive and then prefix their common sign.

Answer 6

A. -43
B. -25
C. 1
D. 4

Answer 7

\[-a+(-b)=-a-b\]
\[-21 + (-13)=?\]

Answer 8

−34

Answer 9

$$\huge -21 + (-13) + (-9)= -[21 + 13 + 9]$$

Answer 10

wdf i am confused

Answer 11

I can't msg you, @skullpatrol, so can you tell me how you type this big numbers? I'l give you a medal!

Answer 12

$$\huge \text{if a and b are both negative, then}$$
$$\huge a+b=-(|a|+|b|)$$

Answer 13

$$\huge\text{Since you are adding all negative numbers,}$$
$$\huge\text{add them as if they were all positive}$$
$$\huge\text{ and then prefix their common sign.}$$

Answer 14

I still don't get it I keep getting \[$$\huge$SEE\]

Answer 15

@skullpatrol

Answer 16

$$\huge$$See?