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Semmy [17]
3 years ago
7

Which choice is equivalent to the expression below?

Mathematics
2 answers:
djyliett [7]3 years ago
8 0
<span>B. 2i √5. To simplify √- 20 , it becomes √(-2)*(-2)*5, then √(-2)^5*5, which then becomes 2i because you cannot find the square root of a negative number. i means √-1, so √-20 is the same as 2i√5.</span>
Alexxandr [17]3 years ago
4 0
D) since
\sqrt{ - 20}  =  \sqrt{ 4 \times  - 5}  = 2 \sqrt{ - 5}  = 2 \sqrt{5 \times ( - 1)}  = 2 \ \sqrt{5} i
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AleksandrR [38]
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3 years ago
Solve: 2x-3=6 I am stuck
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6 0
3 years ago
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lina2011 [118]
To find the median, place the given numbers in order of their value and find the middle number.

Here we have:

57, 61, 58, 54, 68, 51, 49, 64, 50, 48, 65, 52, 56, 46, 47, 55, 42, 60, 62, 43, 69, and 70.

Arranging them in order from least to greatest, we have:

42, 43, 46, 47, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 61, 62, 64, 65, 68, 69, and 70.

There are 22 numbers total; the median will be the mean of the middle two numbers, which are 55 and 56.

To find the mean, add the numbers together and divide the sum by 2.

55 + 56 = 111

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The median of the ages of the US Presidents at the time of their inauguration is 55.5 years.
5 0
3 years ago
One of the roots of the equation x^2−bx+c=0 is equal to 5. Find c in terms of b.
Marizza181 [45]

Answer:

c = 5b - 25

Step-by-step explanation:

If

x² − bx + c = 0

where x = 5

we have

(5)² − b*(5) + c = 0

⇒ 25 - 5b + c = 0

⇒ c = 5b - 25 = 5*(b - 5)

8 0
3 years ago
Read 2 more answers
9% ___ 0.4 will give brainliest<br><br><br><br>pls help :)
loris [4]

Answer:

9% is less than 0.4. 0.4 is really 4/10 which is 40% 40 is greater than 9 therefore 9% is less than 0.4! So your answer is 9%<0.4! I hope this helped!

Step-by-step explanation:

3 0
3 years ago
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