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Alexxandr [17]
3 years ago
7

Which answer is equal to -2i*(-2i)? A) 4 B) -4 C) 4i D) -4i

Mathematics
2 answers:
Nadya [2.5K]3 years ago
6 0
I got letter B which is -4
butalik [34]3 years ago
4 0
\bf \textit{recall that }i^2=-1\qquad therefore
\\\\\\
-2i(-2i)\implies +2^2i^2\implies 4(-1)\implies -4
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prisoha [69]

Answer:

Thx man

Step-by-step explanation:

8 0
3 years ago
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After reading 80% of her e-mails in her inbox, Danette still has M unread emails. Which of the following expressions could repre
Fofino [41]

Answer:

m/(1 - .8)

Step-by-step explanation:

She read 80% of her emails, which is .8 of the total.  So her unread emails would be 100% - 80% = 1 - .8

that means me can be written as:

m = (1 - .8)t

where t is the total

If we solve for t, we get:

t = m/(1 - .8)

4 0
2 years ago
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4 granola bars are shared equally between 8 people. What fraction of a granola bar does each person receive?
andreyandreev [35.5K]

Answer:

1/2

Step-by-step explanation:

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3 years ago
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PLS HELP ME I WILL MARK THE BRAINLIEST
Serga [27]

Answer:

1. 155 yd², 2. 379.54 ft², 5. x = 65.82π

Step-by-step explanation:

1. A = (1/2) · (3 + 13) · 8

A = (1/2)(16)(8)
A = 64
A = bh
A = 13*7
A = 91
64 + 91 = 155
155 yd²

2. A = bh
A = 25x25
A = 625
A = πr²
A = 3.14*12.5²
A = 3.14*156.25
A = 490.625
490.925/2 = 245.4625
625 - 245.4625 = 379.5375
379.54 ft²

3. and 4. Sorry, I don't know how to solve these

5. A = πr²
A = 3.14*7²
A = 3.14*49
A = 153.86
x/154 = 153.86π/360
360x = 154*153.86π
360x = 23694.44π
x = 65.8178889π
x = 65.82π

Hope this helps :)

7 0
2 years ago
In 1789, the dimensions expanded to 96 feet by 32. What was the perimeter?
irakobra [83]
The perimeter is 256 feet.

96 + 96 + 32 + 32 = 256.
8 0
3 years ago
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