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3 years ago

Multiple choice:

1 answer:

7 0

In the given you wrote -2, whereas it should be -2i

z = a + bi and in trigo form | z |.(cos Ф + i.sin Ф).
z = 0 -2i → | z |.(cos Ф + i.sin Ф)
Now let's calculate z:

z² = a²+b² → z² = 0² (-2.i)² → z = -2(i)² →z= -2(-1) → z = |2|
tan Ф = b/a = -2/0 → tan Ф → - ∞ ↔ Ф = -90° or Ф = 270°
then the - 2 I ↔ |2|(cos 270° + i.sin 270°)

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Convert 26 4/5 to an improper fraction

Shalnov [3]

Answer:

Step-by-step explanation:

First you do 26 times 5 which is 130. And then you add 4, which is equal to 134/5

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3 years ago

4.2 minus the product of 12 and a number

borishaifa [10]

Answer:

Four minus the product of one and a number x is 4−(1×x) .

Step-by-step explanation:

Given : Expression 'Four minus the product of one and a number x'.

To find : Write the expression in algebraic form ?

Solution :

Writing the expression as,

The product of one and a number x is written as 1×x .

Four minus the product of one and a number x is written as 4− (1×x)

Re-write the expression in simplest form is 4−x .

Therefore, Four minus the product of one and a number x is 4−(1×x) .

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3 years ago

In a survey of students, 1162 stated they cheated and 2468 stated they did not. If one student is randomly selected what is the

liraira [26]

Answer:

$n = 1162 +2468 =3630$

And the probability that they cheated and we can use the classical definition of probability given by:

$p =\frac{successes}{Total}$

And replacing we got:

$p=\frac{1162}{3630}= 0.320$

So then the probability of people cheated is 0.320 or 32% approximately

Step-by-step explanation:

For this problem we know that in a survey of students, 1162 stated they cheated and 2468 stated they did not.

The total of people is given by:

$n = 1162 +2468 =3630$

And the probability that they cheated and we can use the classical definition of probability given by:

$p =\frac{successes}{Total}$

And replacing we got:

$p=\frac{1162}{3630}= 0.320$

So then the probability of people cheated is 0.320 or 32% approximately

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3 years ago

Last year's computer models are discounted 20%. What was the original price to the nearest dollar of a computer that now costs $

Alisiya [41]

Answer:

Step-by-step explanation:

<h3>If the Original price was $ X , Then </h3>

$x - 0.20x \: = 1480$

$0.8x = 1480$

$x = 1480 \div 0.8$

<h3>So , X = 1850 dollars .</h3>

<h2>Hope this helps you !!! </h2>

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2 years ago

If the complement of an angle is equal to the supplement of four times the angle, then find the measure of the angle.

lisabon 2012 [21]

Answer:

Step-by-step explanation:

Note that:

Two angles are Complementary when they add up to 90 degrees

Two angles are supplementary when they add up to 180 degrees

Let the angle = x

If the complement of an angle is equal to the supplement of four times the angle, then find the measure of the angle.

90 - x = 180 - 4x

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3 years ago