Mathematics High School

How do you write square root of -20 using the imaginary i

Answers

Answer 1

Answer:

Step-by-step explanation:

i² = (-1)

[tex]\sqrt{-20} =\sqrt{20i^{2}}\\\\=\sqrt{2*2*5*i^{2}}\\\\=2i\sqrt{5}[/tex]

Related Questions

PLEASE HELP GIVING BRAINLIEST TO CORRECT ANSWER! 10 POINTS

Janile got 4 kilograms of candy when she went trick-or-treating at Halloween. Since she didn’t want to eat it all, she decided to share it with her 4 friends. If the 5 of them share the 4 kilograms, how much will each of them have?

Answers: (Show explanation)

15,000 tons

150 tons

18,750 tons

600,000,000 tons

Answers

Answer:

it 15,000

Step-by-step explanation:

I hope it work

Please help due today

Answers

Answer:

The event is unlikely.

Step-by-step explanation:

Probabilities under 50% (0.50) are considered unlikely.

Using the given diagram, solve for x.

Answers

Answer:

x is the hypotenuse so you will take a

Bobby is 5 less than Kylie's age. Their combined
age is 43. How old is Kylie?

Answers

Answer:

Kylie is 24 years old

Step-by-step explanation:

kylie = x

Bobby=x-5

x+x-5=43

2x-5=43

2x=43+5

2x=48

X=24 years old

19

If you subtract 5 off of 43 and divide it by two you find Kylie's age. The reason you divide by two is because there are two people and it is a combined age, meaning you would divide by two.

-Ɽ3₮Ɽ0 Ⱬ3Ɽ0

In a bag of marbles, image are red, image are blue, image are green, and image are yellow. You pick a marble without looking. What color marble are you MOST likely to choose?

A.
blue

B.
red

C.
yellow

D.
green

Answers

It will be blue I say lol
Well, I’m not sure. There is no amount for each marble. So realistically you could just guess any of them.
Making a guesstimate isn’t a thing either because you need amounts for that as well.

im begging yall please help me!please?

Question-Susan works for the school newspaper and wants to conduct a survey to ask students whom they will vote for in the upcoming School actions which example should she choose to best represent the entire population ?

Answers

B- asking every tenth student has an advantage of asking more people

Diego want to paint his room purple. He bought one gallon of purple paint that is 30% red paints and 70% blue paints. Diego wants to add more blue to mix that the paint mixture is 20% red, 80% blue.

How much blue paint should Diego add? Test the following possibilities: 0.2 gallons, 0.3 gallons

Answers

Answer:

10 gallons

Step-by-step explanation:

Whats 7 rounded to one decimal place?

Answers

The correct answer is 7or .7

6^8 x 6^3 = 6^5 x 6^x
Find the value of x..... Can you help me

Answers

Answer:

x=6

Step-by-step explanation:

the solution is 6

explanation/steps shown in the picture

Please help due today

Answers

it’s more likely that warren picks a shirt as there’s more shirts than pants. hope this helps!!

Rolando is making buttons that are shaped like circles. Each button has an area of
62 square centimeters. Which measurement shows the circumference of each of the buttons in centimeters?
Reminder: A=π r 2
Helppppp this is due in 5 mins!!!1 :(((

Answers

Lets work backwards. π r2 = 62 cm. 62 / 3.14 = 17.75. Square root of 17.75 = 4.21. Okay, now using the radius of 4.21 we will use the formula C = 2 πr. C = 2 (3.14)(4.21) = 2 (13.22) = 26.44. So the circumference of each button is approximately 26.44 cm.

The radius= 4.21 cm

The circumference of the circle is 26.44 cm.

we have given that

Area  = 62 square centimetres.

What is the formula for the area of circle

[tex]A=\pi r^{2}[/tex]

A=62 and pi=3.14

[tex]62=3.14r^{2}[/tex]

find the value of r square divide both side by 3.14

[tex]r^2=\frac{62}{3.14}[/tex]

[tex]r^2=17.75\\[/tex]

[tex]r=4.21cm[/tex]

[tex]circumference of circle =2\pi r[/tex]

[tex]C=3.14)(4.21)\\\\C= 2 (13.22) \\\\C= 26.44.cm[/tex]

Therefore we get,

The radius= 4.21 cm

The circumference of the circle is 26.44 cm.

To learn more about the circumference of the circle visit:

https://brainly.com/question/24375372

In which set of points is y not a function of x?
{(-4,-4), (-3, -3), (-2,-2), (-1, -2)}
{(4,-4), (3, -3), (3, -2), (1, -1)}
O {(-4,4),(-3, 3), (-2, 2), (-1, 1)}
O {(4,4), (3, 3), (2, 2), (1, 1)}

Answers

Answer:

the first one because when x=-1 y=-2 and that does not directly vary with x

Step-by-step explanation:

I will mark you brainiest if you can answer this

Answers

Answer:

x = -6

Step-by-step explanation:

4x - 2 + 3x - 7 = -51

Simplify

7x - 9 = -51

Move Terms

7x = -42

Divide.

x = -6

good luck, i hope this helps :)

Answer:

-6

Step-by-step explanation:

4x-2+3x-7=-51

we take minus two to the other side and it becomes plus two and -51+2 is -49

4x+3x-7=-49

and we take minus seven to the other side it becomes plus seven and -49+7 iis -42

4x+3x=-42

4x+3X = 7x

7x = -42

and to remove the x we divide both sides by 7

x = -42/7

-42/7 = -6

x=-6

EASY 7TH GRADE MATH 6 out of 8 dentists recommend crest. In a group of 156 dentists, how many of them recommend crest?

Answers

Answer:

117

Step-by-step explanation:

6/8   x/156 so 156/8=19.5*6=117

Given a circle with a diameter of 27 cm, what is the radius?

Answers

The radius is half of a circles diameter. Therefore 27/2 is 13.5 cm and 13.5 cm is the radius.

Can somebody help me please !?

Answers

Answer:

option 4) x = 14  y = 7

Step-by-step explanation:

We are given a side angle and a side length so we can use trigonometry to find the solution

To find x we can use sine because the given side length is opposite to the angle so,

sin(60) = [tex]\frac{7\sqrt{3} }{x}[/tex]

solve for x and you get 14 (make sure you check that your calculator is in degrees)

for either use Pythagorean theorem or remove sine by tangent.

what is the step by step equation for −4+12=−4?
thanks!

Answers

Answer:

the actually answer is -8

Step-by-step explanation:

No solution to solve this answer it’s false

3. The width of a rectangle is 3x – 7. The length of the rectangle is 4x +5.
Find the perimeter of the rectangle.
A. 4x - 14
B. 6x - 14
C. 8x + 10
D. 14x - 4
PLEASSSSEEE

Answers

Answer:

D. 14x - 4

Step-by-step explanation:

P = 2(L + W)

P = 2(4x + 5 + 3x - 7)

P = 2(7x - 2)

P = 14x - 4

Someone help please and make sure it’s right please :)

Answers

I'm going to go with 4 I hope I'm right if it's wrong I'm sorry

Need help! Please solve my age problem!

Answers

Answer:

he's 12 years old

Step-by-step explanation:

12x2=24 <-- mothers age

12+12=24 <-- 12 year later child age

so the child is 24 and the mother is 36

Please rate this question :) thanks

henry subracts 16 from it and gets an answer of 13.9 what was the orginal number​

Answers

Answer:

29.9 is the answer for that question

Answer:

the original number would have been 29.9

Step-by-step explanation:

13.9+16=29.9

What would you multiply by to find 120% of a number?

Answers

You would multiply by 1.2 for example if you wanted to find 120% of 100 you would multiply by 1.2 and get 120

It’s probably rlly simple I just dk how to do it :)

Answers

Answer:

18,0

Step-by-step explanation:

By useing desmos, the line has an x intercept of 18 making that the answer.

 

PLZ MARK AS BRAINLIEST

Answer:

D = 18

Step-by-step explanation:

[tex]6 = \frac{1}{3}d[/tex]

[tex]3*(\frac{1}{3} d) = (3)*(6)[/tex]

[tex]d=18[/tex]

Mario is 4 feet 9 inches tall. What is his approximate height in centimeters? (1 in. ≈ 2.54 cm)

Answers

Answer:

144.78cm

Step-by-step explanation:

4ft 9in is 57 inches

so 57x2.54 is 144.78

Answer:

Mario is 12.446 cm

Step-by-step explanation:

Which of these represents the expression "7 less than twice x"? O 7-2x O 2X-7 O 7 < 7 < 2x O 2x​

Answers

Answer:

the answer for this question is 7-2x

Which numbers are less than –83? Select all that apply.

Answers

Step-by-step explanation:

there aren't any answer choices but on the number line it is anything to the left of -83

Answer:

You didn't provide the answers, but I can still help you :)

Step-by-step explanation:

____________________________________________________________

    anything back here will be correct :)                        -83



Solve one fourth ÷ 7 = __

Answers

it would be 1/28 that’s what i got

Answer:

1/28

Step-by-step explanation:

1/4 divided by 7 is 1/28

4x7 is 1/28

Mrs. Jones attended a Southern Living home party. She purchased a vase which cost $34.99. The shipping charge was $3.00, and 8.25% sales tax was paid on the subtotal which included the shipping charge. How much did she pay for the vase?

Answers

Answer:

$41.12

Step-by-step explanation:

34.99 + 3 = 37.99

37.99 increase 8.25% =

37.99 × (1 + 8.25%) = 37.99 × (1 + 0.0825) = 41.124175

34.99 + $3.00 = $37.99
34.99 * 8.25/100 = $2.886675

round that number to $2.89

then add $37.99 and $2.89

the answer would be 40.88

1. If you wish to calculate the interest on an investment with an interest rate
of 2.85%, what number will you plug into your equation?"
0.00285
2.85
0.285
ОО
0.0285

Answers

Answer:  Choice D)  0.0285

=========================================

Explanation:

You move the decimal point two spots to the left to go from 2.85% to 0.0285

Or you can think of it like this:

2.85% = (2.85)/100 = 0.0285

since "percent" means "per 100"

Which equation has the slope of 3? A. y=3 B.y=x+3 C. y=3-x D. y=3x-1

Answers

d.) y=3x-1. is the answer
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