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3 years ago

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:

$SE=11.88$

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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. : $\dfrac{c}{5}$

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3 years ago

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Otrada [13]

Answer:

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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