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3 years ago

What is f(-4) if f(x)=-2x-8?

Mathematics

1 answer:

antiseptic1488 [7]3 years ago

4 0

Step-by-step explanation:

First we find the function

(

)

To do this we substitute the variable

(

)

for

(

)

∴

(

)

−

(

)

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(2x-8)(2x+9) help please

lesya [120]

$(2x - 8)(2x + 9) \\ 4 {x}^{2} + 18x - 16x - 72 \\ 4 {x}^{2} + 2x - 72$

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3 years ago

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Min is twice as tall as her brother . If min is 5feet 3 inches tall how tall is her brother

liubo4ka [24]

5’3 is 63 inches since her brother is 1/3 larger so 63/3= 21 inches

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4 years ago

LORAN is a long range hyperbolic navigation system. Suppose two LORAN transmitters are located at the coordinates (−60,0) and (6

USPshnik [31]

LORAN follows an hyperbolic path.

The equation of the hyperbola is: $\mathbf{\frac{x^2}{2500} + \frac{y^2}{1100} = 1}$

The coordinates are given as:

$\mathbf{(x,y) = (-60,0)\ (60,0)}$

The center of the hyperbola is

$\mathbf{(h,k) = (0,0)}$

The distance from the center to the focal points is given as:

$\mathbf{c = 60}$

Square both sides

$\mathbf{c^2 = 3600}$

The distance from the receiver to the transmitters is given as:

$\mathbf{2a = 100}$

Divide both sides by 2

$\mathbf{a = 50}$

Square both sides

$\mathbf{a^2 = 2500}$

We have:

$\mathbf{b^2 = c^2 - a^2}$

This gives

$\mathbf{b^2 = 3600 - 2500}$

$\mathbf{b^2 = 1100}$

The equation of an hyperbola is:

$\mathbf{\frac{(x - h)^2}{a^2} + \frac{(y - k)^2}{b^2} = 1}$

So, we have:

$\mathbf{\frac{(x - 0)^2}{2500} + \frac{(y - 0)^2}{1100} = 1}$

$\mathbf{\frac{x^2}{2500} + \frac{y^2}{1100} = 1}$

Hence, the equation of the hyperbola is: $\mathbf{\frac{x^2}{2500} + \frac{y^2}{1100} = 1}$

Read more about hyperbolas at:

brainly.com/question/15697124

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3 years ago

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Nonamiya [84]

Answer:

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Step-by-step explanation:

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3 years ago

a video game has 35 levels in it if you beat 5 of the levels what is the ratio of levels left to the levels that have been beate

lesantik [10]

Answer: 30:5

Step-by-step explanation:

Five levels were beaten so thirty levels are left so whats left to what’s beaten is 30:5

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3 years ago