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Mandarinka [93]
3 years ago
13

Evaluate (a+b)2 for a=-3 and b--7?

Mathematics
1 answer:
Sav [38]3 years ago
3 0

Answer:

-20 or 100

i can't tell if the 2 is supposed to be a square or just multiply by two. The answer is -20 if its multiply by two and 100 if it's squared.

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When Carter runs the 400 meter dash, his
Artemon [7]
300800009777004577/$&84/:6753499$!;:68
3 0
3 years ago
Pls help me not fail
nignag [31]

Answer:

D

Step-by-step explanation:

Using the Cosine rule to find AC

AC² = BC² + AB² - (2 × BC × AB × cosB )

      = 18² + 12² - ( 2 × 18 × 12 × cos75° )

      = 324 + 144 - 432cos75°

      = 468 - 111.8

      = 356.2 ( take the square root of both sides )

AC = \sqrt{356.2} ≈ 18.9

-----------------------------------------

Using the Sine rule to find ∠ A

\frac{18}{sinA} = \frac{18.9}{sin75} ( cross- multiply )

18.9 sinA = 18 sin75° ( divide both sides by 18.9 )

sinA = \frac{18sin75}{18.9} , then

∠ A = sin^{-1} ( \frac{18sin75}{18.9} ) ≈ 66.9°

4 0
3 years ago
9a - 3 (a - 6) = -6 a=___
leonid [27]
9a - 3(a - 6) = -6...distribute thru the parenthesis
9a - 3a + 18 = -6....subtract 18 from both sides
9a - 3a = -6 - 18 ...combine like terms
6a = - 24...divide both sides by 6
a = -24/6
a = - 4
7 0
3 years ago
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Assoli18 [71]

Answer:

3x/16+1/4

Step-by-step explanation:

5 0
2 years ago
PLEASE HELP I GIVE BRAINLIEST
mojhsa [17]

Answer:

A

Step-by-step explanation:

6 0
3 years ago
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