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Dominik [7]
3 years ago
10

A right triangle with an area of ( x 2 − 4 ) u n i t s 2 (x 2 −4)units 2 , and it has a leg that measures ( 2 x + 4 ) u n i t s

(2x+4)units. Determine the length of the other leg of the triangle.
Mathematics
1 answer:
Vika [28.1K]3 years ago
8 0

Answer:

x - 2 units

Step-by-step explanation:

According to the question, the data provided is as follows

The area of the triangle with x^2 - 4

And, the leg has 2x + 4

Based on the above information, the length of the triangle other leg is

Let us assume

y = other leg lengths

So, the area of a triangle = = \frac{1}{2} \times b\times h

Now

x^2 - 4 = \frac{1}{2} (2x+4)y

(x-2)(x+2) = \frac{1}{2} 2(x+2)y

So,

(x-2)(x+2) = (x+2)y

And, finally

x - 2 = y

Therefore the length of other leg is x - 2 units

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Step-by-step explanation:

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2 years ago
Please help The perimeter of a rectangular shape electronic keyboard is 14 ft. Its width is 3 ft longer than its depth
kipiarov [429]

Answer:

Width = 6ft Area = 54 sq ft

Step-by-step explanation:

First, re-read the problem until you understand it and can put it into your own words.  I re-wrote it like this:  "Find the area of a rectangle by first finding the length (L) and the width (W)."   [note that I added "find L and W," but that is how I'm going to solve the problem;  I could also have said that we will need the formulas, P=2L+2W and A=LW, but you knew that already, right?).

 

Translate the problem:

 "The length of a rectangle is 3 ft longer than its width"      means

         L                             =    3             +         W                 (eq1)

 "the perimeter of the rectangle is 30 ft"     means

            P                                = 30                      (eq2)

 

So, now the math is easy, just find L and W so we can compute the area:

     P = 30 = 2L + 2W                         (eq3; from eq2 and the formula for P)

          30 = 2(3+W)  +  2W              (use eq1 to substitute for L)

          30 = 6 + 2W   + 2W              (distribute)

           30 = 6 + 4W                       (collect terms)

            24 = 4W                        (subtract 6 from both sides)

            6 ft = W                         (divide both sides by 4)

 

Use the easiest equation (either eq1 or else eq3) to find L:

          L = 3 + W        (eq1)

          L = 3 + 6

          L = 9 ft

What is the area (A)?

          A = L*W

          A = (9 ft)*(6 ft)

          A = 54 sq ft

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2 years ago
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AleksAgata [21]

Answer:

7.5 seconds

Step-by-step explanation:

h =  - 16 {t}^{2}  + 120t \\  \because \:  we \: have \: to \: find \:  the  \:  time  \: required  \:  \\ for \:  the \:  object \:  to \:  return to \:  its  \:  \\ point \:  of  departure. \\  \therefore \: plug \: h = 0 \: in \: the \: given \: euation. \\  \therefore \: 0 =   - 16 {t}^{2}  + 120t \\ \therefore \:16 {t}^{2}  - 120t = 0 \\ \therefore \:8t(2t - 15) = 0 \\ \therefore \:8t = 0 \:  \: or \:  \: (2t - 15) = 0 \\ \therefore \:t =  \frac{0}{8}  \: or \: t =  \frac{15}{2}  \\ \therefore \:t = 0 \: or \: t = 7.5 \\  \because \: t = 0 \: is \: not \: possible \\ \huge \purple{ \boxed{  \therefore \: t = 7.5 \: seconds}}

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notsponge [240]

Answer:

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A cubic curve starts low and ends high if the leading coefficient is positive, which in this case it is. This means that the left side of the graph falls while the right side rises. Your teacher might say something like "fall to the left, rise to the right" to describe what the end behavior is doing.

More formally "fall to the left" means that as x approaches negative infinity, y = f(x) is approaching negative infinity as well. Similarly, "rise to the right" indicates that as x approaches infinity, y = f(x) heads off to infinity as well. Both x and y = f(x) move in the same direction along their respective number lines; eg, if one goes in the negative direction, then so does the other.

The graph below confirms the answer visually.

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OlgaM077 [116]

Answer:

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Step-by-step explanation:

When x = -1

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= 4 + 1

= 5

When x = 0

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When x = 1

y = - 4 *1 + 1

= - 4 + 1

= - 3

When x = 2

y = -4 * 2 + 1

= - 8 + 1

= - 7

5 0
3 years ago
Read 2 more answers
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