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Eduardwww [97]
4 years ago
7

- square of -9 as a real number for i

Mathematics
1 answer:
STALIN [3.7K]4 years ago
7 0
Answer: 3i

Sq rt. of -9
Can break into sq rt of 9 and -1
-1 = i
Sq rt. of 9 is 3
3i
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Convert 2.16161616 to a rational number in the form of a/b
Phoenix [80]

Answer:

\frac{214}{99}

Step-by-step explanation:

We require to create 2 equations with the repeating digits after the decimal point. Then by subtracting them we eliminate the repeating part.

let x = 2.1616.... → (1)) ← multiply both sides by 100

100x = 216.1616..... → (2)

Subtract (1) from (2)

99x = 214 ( divide both sides by 99 )

x = \frac{214}{99}

4 0
4 years ago
Lucy has 1/5 of a pound of chocolates. She would like to make 4 gift bags with chocolates for her teachers.
Lapatulllka [165]

Answer:

0.05 pound of chocolate per gift bag or 1/20 pound of chocolate per gift bag

Step-by-step explanation:

1/5 divided by 4

=0.05 pound of chocolate per gift bag or 1/20 pound of chocolate per gift bag

-----------------------------------------------------------------------------------------------------------------

<h3><em><u>Hope this helped!! </u></em></h3>
3 0
3 years ago
A $15 pillow with a $30% discount.
Hoochie [10]

Answer:

$10.50, the difference is $4.50

5 0
3 years ago
Read 2 more answers
Someone please help me with these questions
lukranit [14]

Answer:

8) x = 5.41

9) x = 45

10) x = 2.25

Step-by-step explanation:

8) 17/15 = 10/(2x-2)

150 = 34x - 34

reduce:

34x = 184

x = 5.41

9) 6/16 = (x-12)/(2x-2)

16x - 192 = 12x - 12

reduce:

4x = 180

x = 45

10) (x-9)/15 = (2x-9)/10

10x - 90 = 30x - 135

reduce:

20x = 45

x = 2.25

3 0
3 years ago
For 4 weeks, William volunteered as a helper for swimming classes. The first week, he volunteered for 8 hours. He volunteered fo
tino4ka555 [31]

Answer:

He volunteered 10 hrs 15 min on average.

Step-by-step explanation:

The first week: 8 hrs

The second week: 12 hrs

The third week: 12 hrs

The fourth week: 9 hrs

8 + 12 + 12 + 9 = 41 hrs total

41 hours/4 weeks = 10.25 hrs (10 hrs 15 min)

5 0
3 years ago
Read 2 more answers
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