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3 years ago

| \l/ HELP! | \|/ PLEASE!

Mathematics

1 answer:

shutvik [7]3 years ago

7 0

Answer:

Esmeralda added the numerators; Esmeralda added the denominators; Esmeralda did not use the reciprocal of the divisor

Step-by-step explanation:

-5 1/4 divided by 3/2 = -7/2

The same goes for the second fraction.

For the -21/4 and the 3/2 with the parenthesis, they added the numerators and denominators when they should've multiplied.

And they did not use the reciprocal of the divisor because -21/4 divided by 3/2 would mean that you would have to multiply -21/4 by 2/3 not 3/2.

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3 years ago

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galina1969 [7]

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Step-by-step explanation:

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3 years ago

I need help with this question please.

vredina [299]

Answer:

tan(2x)=-24/7

Step-by-step explanation:

Since tan(x)=sin(x)/cos(x)

We are going to need sin(x) any time, so lets find it right away.

To do this, remember that. sin(x)^2 + cos(x)^2=1

so. $sin(x)= \sqrt{1 - (cos(x)^{2} )}=\sqrt{1-(-4/5)^{2} }$

This leads to.

$\sqrt{\frac{25-16}{25} } =\sqrt{\frac{9}{25} }=+/- 3-5$

We have obtained two solutions, -3/5 and 3/5.

We need to pick one, since not all of them are correct for our scenario, in this case, we've been told that x belongs to the range [180, 270], in this range, sin(x)<0.

So in our previous solution, we have that sin(x)= -3/5

Now, to find tang(2x), we need to apply the definition

Tang(2x)=sin(2x)/cos(2x).

Lets remember that

sin(2x)=2*sin(x)*cos(x)

cos(2x)=cos(x)^2 - sin(x)^2.

Lets evaluate our given result.

sin(2x)=2*(-3/5)*(4/5)=-24/25

cos(2x)=(-4/5)^2 - (3/5)^2=7/25

Hence

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3 years ago

Which ratio is equal to 1 1/3 :2

arsen [322]

You can solve this by convert mixed number(s) into improper fraction(s) 2. change both fractions to the equivalent fractions with the same denominator 3. omit denominators and write numerators as a ratio 4. simplify the ratio by dividing both numbers by the highest common factor.

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3 years ago

Please help with math question!!

mihalych1998 [28]

The answer to this problem is C.
Here's why:
The area of a triangle = 1/2 * (base) * (height) (Note: a triangle is half of a rectangle, and rectangles have Area = (base) * (height))

<span>Because the base of ΔAED is half of ΔACB (2 = (1/2) * 4), and height of ΔAED is half of ΔACB (3 = (1/2) * 6), we know that the area of ΔAED will be half of ΔAED.
</span>
So, it's C. I am sure =)
If it helped you, please mark me brainliest! =D
Have a nice day!

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3 years ago