|-9| + |12| = ?

Mathematics

2 answers:

antoniya [11.8K]2 years ago

6 0

Answer:

Step-by-step explanation:

-9=9

9+12=21

Georgia [21]2 years ago

5 0

Answer:

9+12= 21

21 is the answer.

Option D.

~ hope this is right~

You might be interested in

Cos 4A - cos 4B = 8(cos A - cos B) (cos A +cos B) (cos A - sin B) (cos A + sin B)

sveta [45]

.....................

3 0

2 years ago

xz_007 [3.2K]

Answer:

$Center = \boxed{1}, \: \boxed{ - 2} \: ; \: Radius = \boxed{3}$

Step-by-step explanation:

${x}^{2} + {y}^{2} - 2x + 4y - 4 = 0 \\ \\ ({x}^{2} - 2x + 1 - 1) + ( {y}^{2} + 4y + 4 - 4) - 4 = 0 \\ \\ ( {x}^{2} - 2x + 1) + ( {y}^{2} + 4y + 4) - 9 = 0 \\ \\ {(x - 1)}^{2} + {(y + 2)}^{2} = 9 \\ \\ {(x - 1)}^{2} + {(y + 2)}^{2} = {3}^{2} \\ \\ equating \: it \: with \\ \\ {(x - h)}^{2} + {(y - k)}^{2} = {r}^{2} \\ \\ h = 1 \\ k = - 2 \\ r = 3 \\ \\ center = \boxed{1} \: \boxed{ - 2} \: \: radius = \boxed{3}$