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larisa [96]
3 years ago
13

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Mathematics
1 answer:
Nikitich [7]3 years ago
5 0

^_^ 

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8i-(12-4i)+7√-9<br><br> show work please
Tanya [424]

Answer:

33i - 12

Step-by-step explanation:

8i - (12 - 4i) + 7 \sqrt{ - 9}   \\  = 8i - 12  + 4i + 7 \sqrt{9  \times ( - 1)}  \\ = 12i - 12 + 7 \times 3 \sqrt{ - 1}  \\ = 12i - 12 + 21i  \:  \: ( \because  \sqrt{ - 1} = i)\\  = 12i + 21i - 12 \\   \therefore \red{ \bold{8i - (12 - 4i) + 7 \sqrt{ - 9} }=  \purple{ \bold{33i - 12}}}

5 0
3 years ago
Which ratio is greater 4:5 or 5:6?<br>5:6 is greater or no?<br>true<br>false​
Veseljchak [2.6K]
Answer. :
True

Explanation :
The fraction 4/5 is equivalent to 24/30 (To get this I multiplied both the numerator and denominator by 6). The fraction 5/6 is equivalent to 25/30 (To get this I multiplied both the numerator and denominator by 5). ... Since 25 is greater than 24, 25/30 (or originally 5/6) is the larger fraction.
8 0
3 years ago
Add.<br><br> −6+(−5)<br><br><br> 11<br><br> −1<br><br> −11<br><br> I don't know.
Wittaler [7]

Answer:

11

Step-by-step explanation:

-6-5

+11

Hope it is helpful

7 0
3 years ago
Read 2 more answers
True or False: A race car driver tested his car for time from 0 to 60 mph, and in 20 tests obtained an average of 4.85 seconds w
vredina [299]

Answer:

False

Step-by-step explanation:

given that a race car driver tested his car for time from 0 to 60 mph, and in 20 tests obtained an average of 4.85 seconds with a standard deviation of 1.47 seconds.

Sample size n = 20

since population standard deviation is not known, we can use t critical value for finding out the confidence interval

df=19

t critical = 2.045

Margin of error = 2.045*\frac{s}{\sqrt{n} } \\=2.045*\frac{1.47}{\sqrt{20} } \\=0.6722

conidence interval = Mean±Margin of error

= (4.85-0.6722, 4.85+0.6722)\\= (4.1778, 5.5222)

The given confidence interval is (4.52, 5.18)

Hence the statement is false.

5 0
3 years ago
How do I do this plz help me out
Nataliya [291]
It's saying that B is equal to 1, and c is equal to 4. So your gonna square B (multiply it by itself) and add c. Make sense?
6 0
3 years ago
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