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grigory [225]
3 years ago
8

Maggie just read that her computer, which costs $1,500 new, loses 20% of its value every

Mathematics
1 answer:
ira [324]3 years ago
4 0

Answer:

491.52

Step-by-step explanation:

1500×.80×.80×.80×.80×.80=491.52

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Prove that 2x^2+x+8>0 for all real values of x.
Alexus [3.1K]
y = 2x^2 + x + 8 is a polynomial of even degree, with a positive x^2 coefficient, meaning that
- it will have exactly one turning point
- that turning point will be a minimum

So, if the y-coordinate of the turning point is positive, then this polynomial will be positive for all real values of x.

At a turning point, the gradient of y will be equal to 0. The gradient of y is given by 
\frac{\mathrm{d}y}{\mathrm{d}x} = 4x + 1.

To find the turning point, set this equal to 0 and solve for x:
4x + 1 = 0 \implies x = -\frac{1}{4}.

Substituting this value into the equation gives
y = 2(-\frac{1}{4})^2 + (-\frac{1}{4}) + 8 = \frac{1}{4} - \frac{1}{4} + 8 = 8 \ \textgreater \  0.

Since the minimum point of the equation is greater than 0, the equation will be greater than 0 for all real values of x.
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4 years ago
Urgent!! Does anyone know how to solve this?
luda_lava [24]

Answer:34/45

Step-by-step explanation:

5 0
3 years ago
Which is bigger, three fourth of 28 or two fourth of 28?
ExtremeBDS [4]
Well they’re the same number, so three fourths of 28 is bigger than two fourths of 28
8 0
3 years ago
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Please help!!!! question is/.........
Andrew [12]
Area of circle = 3.14 x 6^2 = 3.14 x 36 = 113.04

1/2 circle = 113.04 / 2 = 56.52

Area of rectangle = 8 x 6 = 48

Area of figure = 48 + 56.52 = 104.52 

answer
104.52 ft^2
8 0
4 years ago
The average of four different positive integers is 9. What is the greatest value for one of the integers?
nekit [7.7K]

Answer:

  • 30

Step-by-step explanation:

<u>Sum of those 4 integers is:</u>

  • 4*9 = 36

<u>If the smallest ones are 1, 2 and 3, then the greatest possible integer is:</u>

  • 36 - (1 + 2 + 3) = 30
3 0
3 years ago
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