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labwork [276]
3 years ago
9

Plz help.................

Mathematics
1 answer:
tatuchka [14]3 years ago
6 0

Answer:

x = - 12

Step-by-step explanation:

Given

\frac{x}{x+4} + \frac{7}{x-2} = 1

Multiply through by (x + 4)(x - 2) to clear the fractions

x(x - 2) + 7(x + 4) = (x + 4)(x - 2) ← expand using FOIL

x² - 2x + 7x + 28 = x² + 2x - 8

x² + 5x + 28 = x² + 2x - 8 ( subtract x² from both sides )

5x + 28 = 2x - 8 ( subtract 2x from both sides )

3x + 28 = - 8 ( subtract 28 from both sides )

3x = - 36 ( divide both sides by 3 )

x = - 12

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14/-2-<br> i don’t understand pls help
Ganezh [65]

Answer:

-7

Step-by-step explanation:

5 0
4 years ago
Evergreen Wildlife Preserve has 110 animals, and 66 of them are birds of prey. What percent of the animals are birds of prey?
Korolek [52]

Answer:

60%

Step-by-step explanation:

let ,x% is birds of prey

total animals=110

birds of prey=66

then,

x%of 110=66

x/100×110=66

110x/100=66

1.1x=66

x=66/1.1

x=60%

I'm not sure if this is correct.

7 0
4 years ago
Please help me with this problem​
Paraphin [41]

Answer:

  • domain: [0, 7]
  • range: [-2, 4]
  • is a function? YES

Step-by-step explanation:

The domain is the horizontal extent, which is from x=0 to x=7.

The range is the vertical extent, which is from y=-2 to y=4.

The curve passes the vertical line test, so the relation IS A FUNCTION.

_____

The vertical line test asks whether any vertical line intersects the curve at more than one point. If so, the relation is NOT a function.

8 0
3 years ago
An integer for 53c below zero
motikmotik
-53 for the simple answer

hope this helped
8 0
3 years ago
An experiment has a high degree of ______________ when it shows convincingly that changes in behavior are a function of the inde
adelina 88 [10]

The answer is Internal Validity.

Internal Validity is high in an experiment. when it demonstrates persuasively that changes in behavior are caused by the independent variable and not by unknown factors.

What is Internal Validity?

  • Internal validity is defined as the degree to which the observed results represent the truth in the population under investigation and are not the consequence of methodological flaws.
  • Internal validity is the degree of certainty that the causal link being examined is reliable and unaffected by other factors or variables.
  • The extent to which study results may be extended (generalized) to other contexts, groups, or events is referred to as external validity.

To learn more about Internal Validity visit:

brainly.com/question/9292757

#SPJ4

5 0
1 year ago
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