88.7% of 58<br> Please help me i need the answer!!!!!!!!!!!!!!!!!!!!!1

What method would you use to square the value 3 + √-1 ? In what other cases would you use this method? Explain.

galina1969 [7]

Answer:

1) the types of number are the negative integers (e.g √-1 √-3 √-5 are not defined)

2) the answer is No, proof: 2x√-1 is not defined because √-1 doesn't exist

3) the answer is No, proof: √-1 - 3 is not defined because √-1 doesn't exist

4) the answer is Yes, proof: (√-1 )²= -1 this is a real number

5) the answer is No, proof: (√-1 )^3= (√-1 )²(√-1 )= - 1(√-1 ), and - 1(√-1 ) is not defined because √-1 doesn't exist

6) the result would be defined with the following cases:

√-1+n, n>1

√-1xn, n<0

√-1/n, n<0

7) the result would not be defined with the following cases:

√-1+n, n<0

√-1xn, n>0

√-1/n, n>0

8) to square 3 + √-1, I use the method of complex number

i²= -1, it implies i= √-1

so 3+√-1=3+i, and then (3+√-1)²=(3+i)²= 9 -1+6i= 8-i= 8-√-1

9) it is used for finding complex roots of a number

Step-by-step explanation:

6 0

3 years ago

Ratios! please help me:) match the equivalent ratios I will give brainliest when I can!

Anastasy [175]

Answer:

Step-by-step explanation:

Let's rewrite all the fraction to ratios
4:6, 10:12, 2:5, 4:7

Now, using the direct proportion, if one increase/decrease, the other increase/decrease by the same amount

4:6 = (4x2) : (6x)2 = 8:12
10:12 =( 10:2) : (12:2) = 5:6
2:5 = (2x3) : (5x3) = 6:15
4:7 = (4x2) : (7x2)= 8:14

6 0

3 years ago

Wionna needs to average 5.8 from 14 judges. The mean score from 13 judges is 5.9. What is the lowest score she can receive from

kirill115 [55]

(5.9*13+s)/(13+1) $\geq$ 5.8

(76.7+s)/14 $\geq$ 5.8

76.7+s $\geq$ 81.2

s $\geq$ 4.5

5 0

3 years ago

Read 2 more answers

The time it takes a customer service complaint to be settled at a small department store is normally distributed with a mean of

noname [10]

Answer:

0.0475 = 4.75% probability that a randomly selected complaint takes more than 15 minutes to be settled.

Step-by-step explanation:

Normal Probability Distribution

Problems of normal distributions can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the z-score of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Mean of 10 minutes and a standard deviation of 3 minutes

This means that $\mu = 10, \sigma = 3$