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2 years ago

F(x)=-2x²+x-5 Find f(-6)

Mathematics

1 answer:

FinnZ [79.3K]2 years ago

7 0

Answer:

-83

Step-by-step explanation:

To find f(-6), simply substitute -6 for x in -2x²+x-5:

$\displaystyle-2x^2+x-5\vert_{x=-6}\\\implies-2(36)-6-5=\boxed{-83}$

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The combined height of one for tree and one pine tree is 21 meters. The height of 4 for trees stacked on top of each other is 24

slamgirl [31]

Answer:

The height of the fir tree is 9 meters tall and the pine tree is 12 meters.

Step-by-step explanation:

Given:

Note :→ there is a mistake it is fir tree not for tree.

The combined height of one fir tree and one pine tree is 21 meters.

The height of 4 fir trees stacked on top of each other is 24 meters taller than one pine tree.

Now, to find how tall are the types of trees.

Let the height of one fir tree be $x$ .

And the height of one pine tree be $y$ .

So, the combined height of one fir tree and one pine tree:

$x+y=21.$

$y=21-x.$ .........( 1 )

Now, as given the height of 4 for trees stacked on top of each other is 24 meters taller than one pine tree:

$4x=y+24.$

Putting the value of equation (1) in the place of $y$ :

$4x=21-x+24$

Adding both the sides $x$ we get:

$5x=21+24.$

$5x=45.$

Dividing both the sides by 5 we get:

$x=9\ meters.$

So, the height of one fir tree = 9 meters.

Now, putting the value of $x$ in equation (1) we get:

$y=21-9$

$y=12\ meters.$

Thus, the height of one pine tree = 12 meters.

Therefore, the fir tree is 9 meters tall and the pine tree is 12 meters tall.

6 0

3 years ago

Solve for x X ²-5x=2(leave answer in a surd form)

Lubov Fominskaja [6]

Hello,

x²-5x-2=0
Δ=5²+4*2=33
==>x= (5-√33)/2 or x=(5+√33)/2

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3 years ago

Pls help me guys! Thanks :D

kozerog [31]

The top right is the answer. The base should be square with lengths of 8 and the height is 10.

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2 years ago

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What is the value of the missing angle. A. 50 B. 60 C. 100 D. 240

34kurt

The answer is b 60 degrees

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3 years ago

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What is the slope-intercept form for a line that passes through (4,3) and is parallel to x=0

nikitadnepr [17]

Answer:

x=4

Step-by-step explanation:

x=0 is an undefined slope(straight line vertically)

We need the line to pass through the point (4,3)

So, we just take the x coordinate from the equation and make it also have an undefined slope.

x = 4

6 0

3 years ago