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s344n2d4d5 [400]
3 years ago
11

Which expression is equivalent 18- square root of -25 5i 18-5i 18+5i 23

Mathematics
2 answers:
gizmo_the_mogwai [7]3 years ago
7 0
Option three must b the answer
soldi70 [24.7K]3 years ago
7 0
The square root of -25  = 5i

So its option B,  18 - 5i
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Answer and Step-by-step explanation:

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5 0
3 years ago
there are 15 finalist in a singing competition. the top five singers receive prizes. how many ways can the singer finish first t
Alisiya [41]

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The singers can finish first through fifth in 360360 ways.

Step-by-step explanation:

The order of the singers is important, because they are ranked by positions. So we use the permutations formula to solve this question.

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The number of possible permutations of x elements from a set of n elements is given by the following formula:

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In this question:

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4 0
3 years ago
(iii) (3x + 4)(3x - 5)
kiruha [24]

Answer:

x_{1}=-\frac{4}{3}\\x_{2}=\frac{5}{3}\\

Step-by-step explanation:

(3x+4)(3x-5)=9x^{2} -15x+12x-20=9x^{2} -3x-20\\\\9x^{2} -3x-20=0\\\\D=b^{2} -4ac=(-3)^{2}-4*9*(-20)=9+720=27^{2} \\\\x_1_,_2=\frac{-b +_- \sqrt{D} }{2a}\\\\x_1=\frac{3-27}{18}=\frac{-24}{18} =-\frac{4}{3}\\\\x_2=\frac{3+27}{18}=\frac{30}{18} =\frac{5}{3} \\\\

6 0
3 years ago
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muminat
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5.C
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