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Advocard [28]
3 years ago
5

Simplify the expression to a + bi form: (3+i) + (-12 - 9i)

Mathematics
2 answers:
Kitty [74]3 years ago
4 0
-8i-9 I think but i’m not very sure
Elodia [21]3 years ago
3 0

Answer:

-9-8i

Step-by-step explanation:

(3+i)+(-12-9i)

3+i-12-9i

3-12+i-9i

-9+i-9i

-9-8i

If you're satisfied with the answer, then please mark me as Brainliest.

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A box of tickets has an average of 420; the SD is 84. If we draw at random (with replacement) 50 times and compute the average o
disa [49]

Answer:

Average of the draws equals 420

Standard Error = 11.88

Step-by-step explanation:

Given

\mu = 420

\sigma = 84

n =50

Solving (a): The average of the draws

This implies that we calculate the sample mean

This is calculated as:

\bar x = \mu  --- Sample Mean = Population Mean

So, we have:

\bar x = 420

Solving (b): The standard error

This is calculated as:

SE=\frac{\sigma}{\sqrt n}

So, we have:

SE=\frac{84}{\sqrt {50}}

Using the calculator, we have:

SE=11.88

4 0
3 years ago
Nathan brings cupcakes to school and gives them to his five best friends, who share them equally. If c represents the number of
tatiyna

Answer: \dfrac{c}{5}

Step-by-step explanation:

Given : Nathan brings cupcakes to school and gives them to his five best friends, who share them equally.

i.e. Number of friends = 5

If c represents the number of cupcakes Nathan brings to school, then the number of cupcakes each of his friends receive is given by using division operation :_

c\div 5=\dfrac{c}{5}

Hence, the expression to show how many cupcakes each of his friends receive. : \dfrac{c}{5}

3 0
3 years ago
Can anyone help? Tysm!
Otrada [13]

Answer:

c

Step-by-step explanation:

.

4 0
3 years ago
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Select the graph of the solution. Click until the correct graph appears.<br> 3 x + 1 &lt; 7
QveST [7]

Answer:

The first one lol

Step-by-step explanation:

6 0
3 years ago
-4+ =-1 what is the missing number?
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