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3 years ago

Solve 5(2x + 4) = 15. Round to the nearest thousandth.

Mathematics

2 answers:

hjlf3 years ago

8 0

Step-by-step explanation:

$5(2x + 4) = 15 \\ 10x + 20 = 15 \\ 10x = 15 - 20 \\ 10x = - 5 \\ \\ x = - \frac{5}{10} \\ \\ x = - 2$

iVinArrow [24]3 years ago

6 0

Answer:

-1/2 or -0.5

Step-by-step explanation:

5(2x+4)=15

10x+20=15

10x=-5

x=-5/10

x=-1/2

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morpeh [17]

Answer:

$z = \sqrt{29} ( \cos \: 68 \degree + i \sin 68 \degree)$

Step-by-step explanation:

The trigonometric form of complex numbers is when the complex number is in polar form.

This is given by

$z = r( \cos \theta + i \sin \theta)$

where the modulus r is given by

$r = \sqrt{{2}^{2} + {5}^{2} }$

$r = \sqrt{4 + 25}$

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and the argument is given by

$\theta = \tan \:^{ - 1} ( \frac{y}{x})$

$\theta = \tan \:^{ - 1} ( \frac{5}{2})$

$\theta = 68 \degree$

The trigonometric form then becomes:

$z = \sqrt{29} ( \cos \: 68 \degree + i \sin 68 \degree)$

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