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erik [133]
3 years ago
14

A Rectangular has area 12a^2 and perimeter 14a what are the dimensions of this Rectangular?​

Mathematics
1 answer:
Nataliya [291]3 years ago
5 0

9514 1404 393

Answer:

  3a by 4a

Step-by-step explanation:

For dimensions L and W, the area and perimeter are ...

  A = LW = 12a^2

  P = 2(L+W) = 14a

Using the second equation, we can find L:

  L +W = 7a . . . . . divide by 2

  L = 7a -W

Substituting into the area formula gives the quadratic ...

  (7a -W)(W) = 12a^2

  W^2 -7aW +12a^2 = 0 . . . . arrange in standard form

  (W -3a)(W -4a) = 0 . . . . . . . factor (find factors of 12 that total 7)

Then we have the two solutions ...

  W = 3a, L = 4a

  W = 4a, L = 3a

The rectangle dimensions are 3a by 4a.

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HELP ILL MARK AS BRAINLIEST what’s the surface area?
svetoff [14.1K]

Step-by-step explanation:

SURFACE AREA of a cylinder is 2×pi×r×(h+r)

=> 2×3.14×7×(8+7)

=>43.96×(15)

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4 0
3 years ago
A country's population in 1992 was 72 million. In 1998 it was 76 million. Estimate the population in 2012 using the exponential
stepan [7]
We assume the annual percentage increase is the same. We will work out the constant k using the formula

We have
P = 76
A = 72
t = 6 years (from 1992 to 1998)

Substitute into the formula
76=72e^{6k}
\frac{76}{72}=e^{8k}
Take log both sides give
ln( \frac{76}{72})=ln(e^{6k})
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We can now work out the number of population by the end of 2012 using the formula

We have
A = 72 million
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7 0
3 years ago
For which equation is w= 4 not the solution?
ale4655 [162]

Answer:

w - 2 = 4

Step-by-step explanation:

4-2 is not equal to 4. therefore, w does not equal 4.

3 0
3 years ago
Read 2 more answers
Which of the following situations are equal to 90%? Select all that apply.
dsp73
It’s the letter c


40>36=4% 94%-4%=90
4 0
3 years ago
Can you explain why in detail please?
Igoryamba

it would be the graph on the right.

 Since the equation ends with +2 the line would be 2 above the x axis

4 0
3 years ago
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