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2 years ago

QUICK does anyone know this? if so please answer i need to turn this in asap!

Mathematics

2 answers:

andrezito [222]2 years ago

6 0

Answer:

14,8,-5

Step-by-step explanation:

1. 12-{1+(-3)}

12-{1(-3)} 1-3=-2

12-(-2) -×-=+

12+2

2. 6-{1+(-3)}

6-(1-3)

6-(-2)

6+2

3. 3×6+(-3)

________

-3

18-3

______

-3

_____

-3

=-5

sdas [7]2 years ago

4 0

Answer:

10, 8, -5. Pls tell me if wrong i will retry. Im doing this mentally to be fast.

Step-by-step explanation:

A. 12 - |1 + -3 | = 12 - 2 = 10

B. 6 - -2 = 8

C. 18 -3/-3 = 15/-3 = -5

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The measure of an angle is 78°. What is the measure of a complementary angle?

ki77a [65]

First you need to know the definition of a complementary angle. That means that two angles add up to 90 degrees, or a right angle.

To find an angle complementary to a 78 degree angle, you need to subtract 78 from 90.

90 - 78 = 12

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3 years ago

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The rule is applied to ΔABC. On a coordinate plane, 5 triangles are shown. Triangle A B C has points (2, negative 4), (4, negati

vfiekz [6]

Answer:

Consider triangle ABC with vertices at points A(2,-4), B(4,-4) and C(4,-2).

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Then:

2. The reflection across the y-axis has a rule:

So,

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Step-by-step explanation:

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3 years ago

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What is the rectangular form of z= 40(cos(7pi/6)+ i sin(7pi/6))

Anastaziya [24]

Answer:

C. $z = -20\sqrt{3}-i\,20$

Step-by-step explanation:

The rectangular form of a complex number is represented by the following formula:

$z = a+i\,b$ (1)

Where each coefficient can be determined as function of the polar components:

$a = r\cdot \cos \theta$ (2)

$b = r\cdot \sin \theta$ (3)

Where:

$r$ - Magnitude of the complex number, dimensionless.

$\theta$ - Direction of the complex number, measured in radians.

If we know that $r = 40$ and $\theta = \frac{7\pi}{6}$ , then the rectangular form of the number is:

$a = 40\cdot \cos \frac{7\pi}{6}$

$a = -20\sqrt{3}$

$b = 40\cdot \sin \frac{7\pi}{6}$

$b = -20$

The rectangular form of $z=40\cdot\left(\cos \frac{7\pi}{6}+i\,\sin \frac{7\pi}{6}\right)$ is $z = -20\sqrt{3}-i\,20$ . The correct answer is C.

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2 years ago

Q)on a book case there are 35 science books ,28 history books,10 cook books,and 10 mystery novel .how many books are on the book

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Answer:

Step-by-step explanation:

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3 years ago

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Which of the following is the result of the equation below after completing the square and factoring?

Tems11 [23]

Answer:

D) $(x + \frac{5}{2})^{2} = \frac{9}{4}$

Step-by-step explanation:

Step(i):-

Given equation

x² + 5 x + 8 = 4

⇒ $x^{2} + 2 X \frac{5}{2} x + (\frac{5}{2} )^{2} - (\frac{5}{2} )^{2}+ 8 = 4$

Step(ii):-

By using (a + b)² = a² + 2 a b + b²

⇒ $(x + \frac{5}{2})^{2} - (\frac{5}{2} )^{2}+ 8 = 4$

⇒ $(x + \frac{5}{2})^{2} = 4 + (\frac{5}{2} )^{2} -8$

⇒ $(x + \frac{5}{2})^{2} = (\frac{25}{4} ) -4$

⇒ $(x + \frac{5}{2})^{2} = (\frac{25-16}{4} )$

⇒ $(x + \frac{5}{2})^{2} = \frac{9}{4}$

Final answer:-

$(x + \frac{5}{2})^{2} = \frac{9}{4}$

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3 years ago