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Lostsunrise [7]
3 years ago
8

If i=√-1 , what is i^2 equal to ?

Mathematics
1 answer:
Alja [10]3 years ago
5 0

Answer:

-1

Step-by-step explanation:

If i = √-1, then i^2 = -1.

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The two spheres above have the same center one has a radius of 2 cm and the other one has a radius of 3 cm approximately how muc
Paladinen [302]

Answer:

79.6 cm^3

Step-by-step explanation:

The formula for the volume of a sphere is V = 4/3 πr³.

sphere A radius 2 cm so r[A] = 2 cm

sphere B radius 3 cm so r[B] = 3 cm

distance between the surfaces of the 2 spheres is 1 cm

To find volume of each sphere and the difference in volume:

pi r^2 * r - (1/3) pi r^2 * r = (2/3) pi r^3

8 0
3 years ago
The perimeter of a square is 96m.Find its area.
nadya68 [22]
<h3>Solution</h3>

P = 4a

96 = 4a

a = 24 m

so, the area is

A = a²

A = 24²

A = 24 × 24

A = 576 m²

4 0
2 years ago
Read 2 more answers
Which of the following illustrates the truth value of the given mathematical statements? 6 + 3 = 9, and 4 • 4 = 16
SOVA2 [1]
I mean, they both do. i am not 100% sure, but im pretty sure. Hope this helps!
4 0
3 years ago
FOR BRAINLIEST ANSWER ONLY:<br><br> 2.<br><br> 3.<br><br> 4.<br><br> 6.
nasty-shy [4]

Answer:

2. x = 2 & y = 4

3. x = 4 & y = 2

Step-by-step explanation:

2. x + y = 6

  2x + y = 8  (multiply the first equation by -1,  so you can eliminate the ys)

- x - y = -6

2x + y = 8  (now add the variables together)

x = 2 (plug in x in one of the equations to find out y)

x + y = 6

(2) + y = 6

-2           -2

y = 4

3. 3x + y = 14

          x = 2y (plug in x into the first equation and solve it for y)

3(2y) + y = 14

6y + y = 14

7y = 14

y =  2  (plug in y in one of the equations to find out x)

x = 2y

x = 2(2)

x = 4

4.  One number (x) is 2 more (+2) than twice (times 2) as large as another. their sum is 17. Find the numbers.

2x + 2 = 17 (solve for x)

     -2     -2

2x = 15

x = 7.5

6. 7 (4x + 1) - (x + 6) (start by distributing 7 into the first parenthesis)

  (28x + 7) - (x + 6) (do the same to the other parenthesis by distributing -1)

  (28x + 7)  (-x - 6) (and now just combine like terms)

   28x + 7 - x - 6

   28x - x + 7 - 6

   27x + 1

i hope this helped! if you have any question, pls let me know!

6 0
3 years ago
What is the area of the figure?
stepan [7]

Answer:

252 in²

Step-by-step explanation:

The 3 by 6 tab on the right is the same size as the 3 by 6 notch on the left

moving the tab into the notch make a perfect rectangle

The size of the rectangle will be

12 by 21

12 * 21 = 252

252 in²

6 0
3 years ago
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