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lesantik [10]
3 years ago
14

Which expression is equivalent to the following complex fraction?

Mathematics
2 answers:
iragen [17]3 years ago
8 0

Answer:

The correct answer is D. y-x/y+x

Step-by-step explanation:

I just took the unit test review. :)

Buena suerte

sasho [114]3 years ago
6 0

Answer: (D) \frac{y-x}{y+x}

Explanation:

\frac{\frac{1}{x}-\frac{1}{y}}{\frac{1}{x}+\frac{1}{y}}=\frac{\frac{y-x}{xy}}{\frac{y+x}{xy}}=\frac{y-x}{y+x}

Just a note on writing down these expressions: I recommend using parentheses whenever you can to avoid misinterpretation. An expression 1/x-1/y / 1/x+1/y could be interpreted by someone as 1/x-(1/y / 1/x)+1/y, which is a different thing.

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The function h defined by h(t)=(49 + 4.9t)(10 - t) models the height, in meters, of an object t seconds after it is dropped from
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Answer:

Step-by-step explanation:

Let's FOIL this out and get it into standard quadratic format:

h(t)=-4.9t^2+490. The lack of a linear term in the middle means therewas no upwards velocity, consistent with the object being dropped straight down as opposed to thrown up in the air tand then falling in a parabolic path. The -4.9t² represents the acceleration due to gravity, and the 490 represents the height from which the object was dropped. The constant in a quadratic that is modeling parabolic motion always represents the height from which the object was dropped (or launched). That's how you know.

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sleet_krkn [62]

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the following points would make a trapezoid

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Please help me with this answer having a hard time
Ipatiy [6.2K]

To solve this you must use the rules of PEMDAS (Parentheses, Exponent, Multiplication, Division, Addition, Subtraction)

In this problem we have double parentheses. Which one should we solve first? The answer to that is always the inner most ones:

13[ 6² ÷ (5² - 4²) + 9]

5² - 4²

^^^Here you will have to first take the square of both values

25 - 16

9

13[ 6² ÷ (9) + 9]

Now for the exponents

13[ 6² ÷ (9) + 9]

6²

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13[ 36 ÷ 9 + 9]

Now for the division:

13[ 36 ÷ 9 + 9]

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13[ 4 + 9]

Now for the addition

13[ 4 + 9]

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13[13]

Now for multiplication

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Hope this helped!

~Just a girl in love with Shawn Mendes

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