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Anika [276]
3 years ago
13

If f(x)=x2+3x−2, find f(−2).

Mathematics
2 answers:
Arturiano [62]3 years ago
4 0

Answer:

Answer:f(-2)=-12

Step-by-step explanation:

Apply the (-2) to the x in the equation

(-2)2+3(-2)-2

Simplify

-4-6-2

-12

Nezavi [6.7K]3 years ago
3 0

Answer:f(-2)=-12

Step-by-step explanation:

Apply the (-2) to the x in the equation

(-2)2+3(-2)-2

Simplify

-4-6-2

-12

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Robert is adding a In-ground pool to his his back yard. The pool will be 13 m long. 10 m wide and 2m deep . How much water in m
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Answer:

d) 260m^3

Step-by-step explanation:

length x width x height

13*10*2 = 260m³

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In a city, the distance between the library and the police station is 3 miles less than twice the distance between the police
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The answer is 4 miles
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Four students were discussing how to find the unit rate for a proportional relationship. Which method is valid? “Look at the gra
IgorC [24]

Answer:  The correct answer is: [A]:

__________________________________________________

       " Look at the graph of the relationship.  Find the y-value of the point that corresponds to x = 1 .   That value is the unit rate. "

__________________________________________________

Step-by-step explanation:

__________________________________________________

Note that the "unit rate" is the term that refers to:

a "quantity" / or "quantitative value" ;  

       →  of some type of "countable units"

{e.g. "currency"  — [such as:  dollars, cents,  pounds] ; "distance/length/ width/ height" — [such as:  miles, kilometers, meters, centimeters, yards, feet, inches] ;  pieces of fruits — [such as:  number of apples;  cans of soda, number of red dresses] ;  

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 per "single unit" of something — {e.g. per hour; per minute; per mile; per ounce; per hour; per dollar, per kilometer, per day, per week.

   {e.g.

             →    " 3 apples eaten  per [single] apricot eaten" ;

             →  " 46 miles per hour.

             →   " 8.3 cents per oz."  ;

             →  " 5 Liters of soda per dollar " ;

             →   " 2.3 grams per mole " ;

             →  " 4.6 mg solute / kg of solvent " ;  

             →  " 5 km / hr " ;  {that is:  " 5 km per hr " } .

             →  " 3 yds. per [single] square inch."

             →  " 35 parts per hundred" ; {that is:  " 35 percent" ; or: " 35 % " . } .

             →    " ... The cilantro is on sale for 33 cents per bundle ...} ."

   →  ... to provide a few examples.  

__________________________________________________

     On on Cartesian plane graph,  the  "x-axis" is located on the "horizontal axis" that represents the "independent variable" (or, at times, the "experimental value" — which can be manipulated — or "controlled" —or  be subjected to being "manipulated" / "controlled" / or, "selected".

   The "y-axis" is located on the "vertical axis" that represents the "dependent variable" (or, at times, the "control value") that cannot be "manipulated" / controlled/ or "selected" / since it represents the "y-value" of the corresponding coordinate to which the "x-value" happens to corresponds to at the given value for "x" .

   So, if the "unit rate" represents the "single unit rate" ;  we look at "x = 1 " ;  since we are "choosing" this particular "single" rate of per "single" (i.e. "1" ) ; so we do not have a choice in what "y-value" of the particular graph to select.  We can control the fact that we are "choosing" to find the "unit" rate, so we select the "independent variable" , "x = 1 " . We then examine the "corresponding y-value" that happens to exist when "x = 1 " .

 {Note that we have "no control" over what that "y-value" is ; at the: "[point which:  " x = 1 .] . "

_________________________________________________  

→  As such, that "y-value" [insert that numeric "y-value" ;                        followed by the units represented by the "y-axis" ] ;

            per  " 1 " [insert "single unit" represented by the "x-axis" ] ;

_________________________________________________    

           →   is the:  "unit rate" .

__________________________________________________

So:  

    The correct answer is:    [A]:  

__________________________________________________

     " Look at the graph of the relationship.  Find the y-value of the point that corresponds to x = 1 .   That value is the unit rate. "

__________________________________________________

Hope this answer is helpful to you!

    Best wishes to you in your academic endeavors —

            and within the "Brainly" community!

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Answer:

Step-by-step explanation:

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3 years ago
Select each pair of expressions that are equivalent. 3x + 14 – x + 112 and 4x + 134 2 + 6x and 2(3x + 1) 3(x + 1) – (1 – x) and
Levart [38]

Answer:

Options (2), (4) and (5)

Step-by-step explanation:

Option 1

(3x + 14 - x + 112) and (4x + 134)

Since, (3x + 14 - x + 112) = (3x - x) + (12 + 112)

                                      = 2x + 124

Therefore, (3x + 14 - x + 112) ≠ (4x + 134) [Not equivalent]

Option 2

(2 + 6x) and 2(3x + 1)

2(3x + 1) = (6x + 2)

Therefore, (2 + 6x) = (6x + 2) [Equivalent]

Option 3

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Since, 3(x + 1) - (1 - x) = 3x + 3 + x - 1

                                  = (3x + x) + (3 - 1)

                                  = 4x + 2

Therefore, (2x + 3) ≠ (4x + 2) [Not equivalent]

Option 4

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Since, [4(x + 1) - x - 4] = 4x + 4 - x - 4

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                                   = 3x

Therefore, 3x = [4(x + 1) - x - 4] [Equivalent]

Option 5

(5.5 + 2.2x + 3.8x - 4.1) and (1.4 + 6x)

Since, (5.5 + 2.2x + 3.8x - 4.1) = (2.2x + 3.8x) + (5.5 - 4.1)

                                                 = (6x + 1.4)

Therefore, (1.4 + 6x) = (6x + 1.4) [Equivalent]

4 0
3 years ago
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