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3 years ago

Does anyone know this answer to this questions

Mathematics

1 answer:

7nadin3 [17]3 years ago

4 0

ANSWER

-4.0

EXPLANATION

The given trigonometric equation is

$\tan \: 45 \degree - 10 \: \cos \: 60 \degree$

From special angles or using the unit circle.

$\tan \: 45 \degree = 1$

$\cos \: 60 \degree = \frac{1}{2}$

We make the substitution to get:

$1 - 10 ( \frac{1}{2} ))$

This simplifies to:

$1 - 5 = - 4$

Hence the correct answer is -4.0

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0.25 divided by 0.14

Fittoniya [83]

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2 years ago

Explain how you would use properties do you write an expression equivalent to 7y+4b-3y.

erica [24]

1st you combine like terms so subtract 7y and 3y and you get 4y. So this is the final answer: 4y+4b.

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3 years ago

PLEASE HELP ASAP

maria [59]

Answer:

First option: $3x^2-5x=-8$

Second option: $2x^2=6x-5$

Fourth option: $-x^2-10x=34$

Step-by-step explanation:

Rewrite each equation in the form $ax^2+bx+c=0$ and then use the Discriminant formula for each equation. This is:

$D=b^2-4ac$

1) For $3x^2-5x=-8$ :

$3x^2-5x+8=0$

Then:

$D=(-5)^2-4(3)(8)=-71$

Since $D$ this equation has no real solutions, but has two complex solutions.

2) For $2x^2=6x-5$ :

$2x^2-6x+5=0$

Then:

$D=(-6)^2-4(2)(5)=-4$

Since $D$ this equation has no real solutions, but has two complex solutions.

3) For $12x=9x^2+4$ :

$9x^2-12x+4=0$

Then:

$D=(-12)^2-4(9)(4)=0$

Since $D=0$ this equation has one real solution.

4) For $-x^2-10x=34$ :

$-x^2-10x-34=0$

Then:

$D=(-10)^2-4(-1)(-34)=-36$

Since $D$ , this equation has no real solutions, but has two complex solutions.

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3 years ago

6) Does the mapping diagram show a function?

Serhud [2]

Answer:

No, you cannot have the same input for 2 different outputs

Step-by-step explanation:

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2 years ago

Someone please help! Thxx

tangare [24]

Answer:

E, needs more info to be determined

Step-by-step explanation:

We know that Kai takes 30 minutes round-trip to get to his school.

One way is uphill and the other is downhill.

He travels twice as fast downhill than uphill.

This means that uphill accounts for 20 minutes of the round-trip and downhill accounts for 10 minutes of his trip.

However, even with this information, we do not know how far his school is.

In order to figure out how far away his school is, we would need more information about the speed at which Kai is traveling.

Simply knowing that he travels twice as fast downhill is not enough.

This question could only be solved by knowing how many miles Kai travels uphill or downhill in a given time.

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3 years ago