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3 years ago

Which of the following is a solution of x2 − 8x = –27?

Mathematics

2 answers:

Dominik [7]3 years ago

8 0

Answer:

Its 4 plus i square root of eleven

Step-by-step explanation:

Sergeu [11.5K]3 years ago

4 0

Its 4 plus i square root of eleven

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The width of a rectangle measures (9h 1) centimeters, and its length measures

Yanka [14]

Answer:

(22h - 8) centimeters

Step-by-step explanation:

Perimeter of a rectangle = 2(length + width)

= 2{(9h - 1) + (2h - 4)}

= 2(9h - 1 + 2h - 4)

= 2(11h - 4)

= (22h - 8) centimeters

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3 years ago

Can anyone help me solve a trigonomic identity problem and also help me how to do it step by step?

dusya [7]

$\bf cot(\theta)=\cfrac{cos(\theta)}{sin(\theta)}
\qquad csc(\theta)=\cfrac{1}{sin(\theta)}
\\\\\\
sin^2(\theta)+cos^2(\theta)=1\\\\
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$\bf \cfrac{cos(\theta )cot(\theta )}{1-sin(\theta )}-1=csc(\theta )\\\\
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\cfrac{cos(\theta )\cdot \frac{cos(\theta )}{sin(\theta )}}{1-sin(\theta )}-1\implies \cfrac{\frac{cos^2(\theta )}{sin(\theta )}}{\frac{1-sin(\theta )}{1}}-1\implies 
\cfrac{cos^2(\theta )}{sin(\theta )}\cdot \cfrac{1}{1-sin(\theta )}-1
\\\\\\
\cfrac{cos^2(\theta )}{sin(\theta )[1-sin(\theta )]}-1\implies 
\cfrac{cos^2(\theta )-1[sin(\theta )[1-sin(\theta )]]}{sin(\theta )[1-sin(\theta )]}$

$\bf \cfrac{cos^2(\theta )-1[sin(\theta )-sin^2(\theta )]}{sin(\theta )[1-sin(\theta )]}\implies \cfrac{cos^2(\theta )-sin(\theta )+sin^2(\theta )}{sin(\theta )[1-sin(\theta )]}
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\cfrac{cos^2(\theta )+sin^2(\theta )-sin(\theta )}{sin(\theta )[1-sin(\theta )]}\implies \cfrac{\underline{1-sin(\theta )}}{sin(\theta )\underline{[1-sin(\theta )]}}
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\cfrac{1}{sin(\theta )}\implies csc(\theta )$

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3 years ago

Question (Multiple Choice Wor (07.01) Which of the values in the set {3,4,5,6) is a solution to the equation 4x + 2 = 22? 3 4 5

Murljashka [212]

Answer:

4x+2=22

4x+2-2=22-2

4x=20

4x/4=20/4

x=5

6 0

3 years ago

How long does it take a runner to run 12km if he is running at a speed of 7km/h

Rama09 [41]

Answer:

about an hour and 42 minutes

Step-by-step explanation:

Time=Distance/Speed

3 0

3 years ago

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What 4.2 times 0.7 /a is 294 /b is 2.94 /c 29.4

zvonat [6]

Answer:

29.4

Step-by-step explanation:

3 0

3 years ago

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