What is an imaginary number?

1 answer:

8 0

An imaginary number is a complex number that can be written as a real number multiplied by the imaginary unit i, which is defined by it's property i² = −1. The square of an imaginary number bi is −b². For example, 5i is an imaginary number, and it's square is −25.

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Evaluate <br> a<br> +<br> 4<br> a+4a, plus, 4 when <br> a<br> =<br> 7<br> a=7a, equals, 7.

Scilla [17]

<em>When evaluating $a=7$ then we get that the expression is 11</em>

<h2>Explanation:</h2>

As I understand the expression is the following:

$a+4$

Let's call, that expression as $E$

So we are asked to find the value of the expression when $a=7$ . In other words, we need to substitute $a=7$ , so:

$E(7)=(7)+4 \\ \\ E(7)=11$

So <em>when evaluating $a=7$ then we get that the expression is 11</em>

<h2>Learn more:</h2>

Distributive property: brainly.com/question/10794694

#LarnWithBrainly

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3 years ago

12. When 64 is divided by x, the quotient is a negative

sergey [27]

J. -8 is the correct answer

8 0

3 years ago

Team tool bella gathered 15 pounds of wood in 1/3 of an hour whats there speed per hour

sattari [20]

15*3=45
so the 45 pounds per hour would be the speed

5 0

3 years ago

Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. n = 195,

Semenov [28]

Given:
n = 195, sample size.
x = 162, successes in the sample

The proportion is
p = x/n = 162/195 = 0.8308

n* p = 195*0.8308 = 162
n*(1-p) = 195*(1 - 0.8308) = 33
If n*p >= 10, and n*(1-p) >= 10, then the sample proportions will have a normal distribution. This condition is satisfied.

The proportion mean is
μ = 0.8308
The proportion standard deviation is
$\sigma = \sqrt{ \frac{p(1-p)}{n} } = \sqrt{ \frac{0.8308(1-0.8308)}{195} } =0.0269$

σ/√n = 0.0269/√195 = 0.00192

At the 95% confidence level, the interval for the population proportion is
(μ - 1.96(σ/√n), μ + 1.96(σ/√n))
= (0.8308 - 1.96*0.00192, 0.8308 + 1.96*0.00192)
= (0.827, 0.8345)

Answer: The 95% confidence interval is (0.827, 0.835)

5 0

3 years ago

Evelyn brought 3 railroad ties to form the sides for a triangular flower bed. two of the railroad ties were 9 feet long and one

vagabundo [1.1K]

To be a triangle, any two of the side lengths added together must be greater than the third length.

9+15 > 9

9+9 > 15

Therefore, yes, the design can be made.

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3 years ago