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3 years ago

A friend is someone _____________________________.

SAT

2 answers:

Pachacha [2.7K]3 years ago

7 0

Answer:

Explanation:

ser-zykov [4K]3 years ago

6 0

Answer:

the answer is D

Explanation:

I don't really know how I would explain it

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What are the three fundamental principals of mnemonics?

Lapatulllka [165]

They are Imagination, association and location

4 0

3 years ago

If there are 12 x 1023 oxygens in a sample of water, how many grams of hydrogen are in the sample?.

AveGali [126]

The amount of grams of hydrogen that are in the water sample is;

3.985 g

<h3>Avogadro's number</h3>

We are given that;

Number of moles of oxygen in a sample of water = 12 × 10²³

Now, the chemical formula of a molecule of water is H₂O. This means that for every 1 atom or molecule of oxygen, there must be 2 hydrogen atoms or molecules present.

Since Number of moles of oxygen in the sample is 12 × 10²³, then number of moles of hydrogen will be twice that = 2 × 12 × 10²³ = 24 × 10²³ moles

Now, molar mass of hydrogen is 1 g/mol and we know that;

Molar mass = Avogadro's number(6.023 × 10²³) moles

Thus;

6.023 × 10²³ moles = 1 g/mol

Thus; 24 × 10²³ moles of hydrogen = ( 24 × 10²³ × 1)/(6.023 × 10²³)

⇒ 3.985 g

Read more on Avogadro's number at; brainly.com/question/914267

3 0

2 years ago

What is the sum of the complex numbers 6+2i and 3+5i, where i=sqrt(-1)

m_a_m_a [10]

Answer:

The sum of the complex numbers is $9+i\,7$ .

Explanation:

Let be $u = 6 + i\,2$ and $v = 3 + i\,5$ , the sum of the complex number can be found by algebraic means. That is:

1) $u = 6 + i\,2$ , $v = 3 + i\,5$ Given.

2) $u+v = (6+i\,2)+(3+i\,5)$ Definition of addition.

3) $u+v = (6+3) + (2\,i + 5\,i)$ Commutative and associative properties.

4) $u+v = 9 + (2+5)\,i$ Definition of addition/Distributive property.

5) $u + v = 9 + i\,7$ Definition of addition/Commutative property/Result.

The sum of the complex numbers is $9+i\,7$ .

3 0

3 years ago

Lydia graphed δlmn at the coordinates l (0, 0), m (2, 2), and n (2, −1). She thinks δlmn is a right triangle. Is lydia's asserti

nadya68 [22]

No product results in -1, hence δlmn is NOT a right triangle showing that lydia's assertion is incorrect

<h3>Perpendicular lines</h3>

In order to determine whether triangle lmn is right-angled, we need to determine the slope of lm, ln, and mn first as shown:

For the slope of lm:

$m_{lm} = \frac{2-0}{2-0}\\ m_{lm} =2/2\\m_{lm} =1$

For the slope of ln:

$m_{ln} = \frac{-1-0}{2-0}\\m_{ln} =-1/2\\$

For the slope of mn:

$m_{mn} = \frac{-1-2}{2-2}\\m_{ln} =-3/0 = \infty\\$

If any of the two lines is perpendicular, hence the triangle lmn is right-angled.

To check, we will take the product of the slopes and see if it is equivalent to -1.

Product of slope lm and ln

$m_{lm}\times m_{ln} = 1 \times -1/2\\m_{lm}\times m_{ln} = -1/2$

Since no product results in -1, hence δlmn is NOT a right triangle showing that Lydia's assertion is incorrect

Learn more on slopes here: brainly.com/question/3493733

8 0

2 years ago

Read 2 more answers

Which sentence best uses a split infinitive to clearly emphasize the message of safe driving? Before getting behind the wheel, y

ipn [44]

Young drivers must remember to always turn off cell phones before getting behind the wheel.

A split infinitive is often occurs when other words come between the two parts of the infinitive.They may look informal and result in confusion.

Split infinitive in a sentence can be handled by the rearrangement of the the sentence so that nothing is between the two parts of the infinitive.

Conclusively, we can say that split infinitive sometimes look informal and may result in confusion but it can be handle by rearranging the sentence.

Learn more from

brainly.com/question/8990731

8 0

2 years ago