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Sonbull [250]
3 years ago
9

HELP!!!! Simplify -2i x (-2i)

Mathematics
2 answers:
vredina [299]3 years ago
8 0

Answer:

-4

Step-by-step explanation:

-2i times (-2i) can be rewritten as (-2)^2*i^2.

Recalling that i^2 = -1, we then have (-2)^2*(-1)

Completing this evaluation, we get -4.

zaharov [31]3 years ago
7 0

Answer:

- 4

Step-by-step explanation:

note that i² = (\sqrt{-1})² = - 1

- 2i × - 2i

= - 2 × - 2 × i² = 4 × - 1 = - 4


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B

Step-by-step explanation:

9 out of 36 chose country, that is expressed as a fraction

\frac{9}{36} = \frac{1}{4}

Thus calculate this fraction of 240

\frac{1}{4} × 240 = \frac{240}{4} = 60 → B

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What number is 35% of 60
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21

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60*.35

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Brainliest question!!!AABC transforms to produce AAB C. Which transformation did NOT take place???
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3 years ago
Solve. {3d−e=7 d+e=5 Use the linear combination method. The solution is (2, −1). There are infinitely many solutions. The soluti
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The solution of the given equations are (3,2).

Step-by-step explanation:

Given equations are :

3d−e=7 ...(1)

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7 0
3 years ago
The perimeter of a rectangular field is 60 meters. Its area is 200 square meters. Find its dimensions.
Vanyuwa [196]

Answer:

20 m by 10 m

Step-by-step explanation:

let w be width and l be length , then

2(l + w) = 60 ( divide both sides by 2 )

l + w = 30 ( subtract w from both sides )

l = 30 - w → (1)

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Substitute l = 30 - w into (2)

w(30 - w) = 200 ← distribute parenthesis on left side

30w - w² = 200 ( subtract 200 from both sides )

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Equate each factor to zero and solve for w

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Substitute these values into (1)

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dimensions of field is 20 m by 10 m

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