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katrin2010 [14]
3 years ago
13

Explain why x2+81=0 does not have a solution

Mathematics
1 answer:
Stella [2.4K]3 years ago
6 0

Answer:

You have to take square root of -81

Step-by-step explanation:

It does not have a solution because you'd have to take the square root of -81

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The perimeter of a rectangle is 234 meters.
Licemer1 [7]

I am going to show you how easy this is. Once you understand, you will be able to do this forever.

:

Assuming the side of the rectangle are (L) length and (W) width, the perimeter:

2L + 2W = 234

:

"the rectangle is twice as long as it is wide,", the equation for this statement:

L = 2W

:

In the first equation, we can replace L with 2W, then we have

2(2W) + 2W = 234

4W + 2W = 234

6W = 234

Divide both sides by 6

W = 234%2F6

W = 39 meters is the width

:

Remember it said the length is twice the width, therefore:

L = 2(39)

L = 78 meters is the length

:

:

Check this by finding the perimeter with these values

2(78) + 2(39) =

156 + 78 = 234

7 0
2 years ago
The speed of a stream is 2 mph. A boat travels 4 miles upstream in the same time it takes to travel 8 miles downstream. What is
Amanda [17]
4 = (r-2) t

8 = (r+2) t

4 = (r-2) * [8/(r+2)]

4 = (8r-16)/ (r+2)  . . .multiply by 2


4r + 8 = 8r - 16

4r = 24

r = 6

hope this helps
7 0
3 years ago
Alex invests his money in an account paying 2% interest compounded semiannually. What is the effective annual yield on this acco
Travka [436]

Answer: 2.01%.

Step-by-step explanation:

Suppose Alex invests $1 into the account for one year. The formula is A=P0⋅(1+rk)N⋅k with P0=$1. We know that r=0.02 and k=2 compounding periods per year. Now, N=1 year. Substituting the values we have A=$1⋅(1+0.022)2=$1.0201. Now, to calculate the effective annual yield, we will use the formula rEFF=A−P0P0. rEFF=1.0201−11=0.0201 or 2.01%. When rounded to two decimals, rEFF=2.01%. However, do not include the % in your answer.

3 0
2 years ago
4 12 36 108 n ? whats after n
lilavasa [31]

Answer:

324

Step-by-step explanation:

4x3=12

12x3=36

36x3=108

108x=324

5 0
2 years ago
Angela wrote the number 186,425 on the board in which number is the value of the digit six exactly 10 times the value of the dig
Butoxors [25]

So what’s the question? What are we trying to find?

4 0
3 years ago
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