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zalisa [80]
3 years ago
14

What is the difference?

Mathematics
1 answer:
babymother [125]3 years ago
8 0

Answer:

  \dfrac{x^2+3x-12}{(x+3)(x-5)(x+7)}

Step-by-step explanation:

Factor the denominators, then use a common denominator to add the terms.

   \dfrac{x}{x^2-2x-15} -\dfrac{4}{x^2+2x-35} =\dfrac{x(x+7)}{(x+3)(x-5)(x+7)}-\dfrac{4(x+3)}{(x+3)(x-5)(x+7)}\\\\=\dfrac{x^2+7x-4x-12}{(x+3)(x-5)(x+7)}=\boxed{\dfrac{x^2+3x-12}{(x+3)(x-5)(x+7)}}

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14. Define a Variable
andreyandreev [35.5K]

Answer: In mathematics, a variable is a symbol which functions as a placeholder for varying expression or quantities, and is often used to represent an arbitrary element of a set. In addition to numbers, variables are commonly used to represent vectors, matrices and functions

Step-by-step explanation:A symbol for a value we don't know yet. It is usually a letter like x or y.

Example: in x + 2 = 6, x is the variable.

Why "variable" when it may have just one value? In the case of x + 2 = 6 we can solve it to find that x = 4. But in something like y = x + 2 (a linear equation) x can have many values. In general it is much easier to always call it a variable even though in some cases it is a single value.

6 0
3 years ago
Smith:24 Munoz:32 Park:20 Find the ratios and write in simplest form. Smith to Munoz to Park
Rus_ich [418]
The answer is:  " 6: 8 : 5 " .
______________________________
Given:  "24: 32: 20" ;  Divide by "4" :


24: 32: 20 
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______________________________
to get:  " 6: 8 : 5 " .
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3 0
3 years ago
*i'll give brainliest*
My name is Ann [436]

Answer:1/3 feet per hour

Step-by-step explanation:

4 0
3 years ago
Which of the following describes the probability distribution below? A probability distribution is shown. The probability of 1 i
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Step-by-step explanation:

7 0
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Read 2 more answers
The delivery guy pushes a stove forward with a force of 80 Newtons, the stove has 115 Newtons. Does the stove move? Is the net g
PtichkaEL [24]
I think it doesn’t move unless you push the same amount of force or more to make the stove more. wouldn’t The net force be 35 because 115-80=35
and They seem unbalanced. If anyone else sees think feel free to correct me.
8 0
3 years ago
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