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Luden [163]
3 years ago
8

10 POINTS PLEASE HELP !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Which of the following is the correct notation for the complex number "√-81 - 4"?

-44+9i

14-9i

-14+i√9

-14+√-81
Mathematics
2 answers:
loris [4]3 years ago
8 0
I think its -44+9i if i am not right i am so sorry<span>
</span>
dexar [7]3 years ago
7 0

Answer

-14+9i is the correct answer hope this helps

You might be interested in
a park is 4 times as long as it is wide. if the distance around the park is 12.5 kilometers, what is the area of the park?
blsea [12.9K]
So, first, what are the two sides?

let's call then x and y

we know that 2(x+y)=12.5 (that's the distance around)

so that means that x+y=6.25 (I just divided both by 2)

now, x=4y (from "4 times as long as it is wide")

so we can substitute:

x+4x=6.25

5x=6.25

x=1.25

so one side, is 1.25 and the other will be 1.25*4=5

and for the area we multiply the two:

1.25*5=6.25 square kilometers, and this is the answer!
7 0
3 years ago
Read 2 more answers
Pretty sure this work is wrong , need it corrected
Makovka662 [10]
C/30 = 8/12
c/30 = 2/3
3c = 60
c = 60/3
c = 20
8 0
3 years ago
It’s shape is one whole what fraction greater than one names the parts that are shaded
wolverine [178]
Its probably a fraction. 

You would know the answer if you researched what your question was on google
4 0
3 years ago
Please help me answer thanks.
Dmitry_Shevchenko [17]

Answer:

see explanation

Step-by-step explanation:

Given that M is directly proportional to r³ then the equation relating them is

M = kr³  ← k is the constant of proportion

To find k use the condition when r = 4, M = 160, thus

160 = k × 4³ = 64k ( divide both sides by 64 )

2.5 = k

M = 2.5r³ ← equation of variation

(a)

When r = 2, then

M = 2.5 × 2³ = 2.5 × 8 = 20

(b)

When M = 540, then

540 = 2.5r³ ( divide both sides by 2.5 )_

216 = r³ ( take the cube root of both sides )

r = \sqrt[3]{216} = 6

5 0
3 years ago
Evaluate the expression when a=-5 and c=3.<br> a-5c
Vinil7 [7]

Answer:

its either -20 or -7

Step-by-step explanation:

i believe its -20 tho hope it helps

8 0
3 years ago
Read 2 more answers
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