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Nady [450]
2 years ago
12

I got this one wrong could you tell me which ones are correct

Mathematics
1 answer:
Bogdan [553]2 years ago
5 0

Answer:

you should have not picked d(t)=10, when t =20, and you also need to pick d(30)=d(70), and everything else seems correct

Step-by-step explanation:

The reasoning why d(t)=10, when t=20 is because if we rearrange this statement it's the same thing as saying d(20)=10, which if we were simply look at the graph it's a false statement

Secondly the reason why d(30)=d(70) if correct one is because if we were look back at the graph both d(30) and d(70) is equal to an output y value of 40

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Which of the following is an extraneous solution of (45-3x)^1/2=x-9?
Iteru [2.4K]

Answer:

C. x =3

Step-by-step explanation:

Extraneous solution is that root of a transformed equation that doesn't satisfy the equation in it's original form because it was excluded from the domain of the original equation.

Let's solve the equation first

\sqrt{45-3x} = x-9\\Taking\ square\ on\ both\ sides\\{(\sqrt{45-3x})}^2 = {(x-9)}^2\\45-3x = x^2-18x+81\\0 = x^2-18x+81-45+3x\\x^2-15x+36 = 0\\x^2-12x-3x+36 = 0\\x(x-12)-3(x-12) = 0\\(x-3)(x-12)\\x-3 = 0\\=> x =3\\x-12 = 0\\x = 12\\We\ will\ check\ the\ solutions\ one\ by\ one\\So,\\for\ x=3\\\sqrt{45-3(3)} = 3-9\\\sqrt{45-9} = -6\\\sqrt{36}= -6\\6\neq -6\\For x=12\\\sqrt{45-3(12)} = 12-9\\\sqrt{45-36} = 6\\\sqrt{36}= 6\\6=6

Hence, we can conclude that x=3 is an extraneous solution of the equation ..

3 0
3 years ago
Find the value of x. Then find the measure of each labeled angle.
Umnica [9.8K]

Step-by-step explanation:

Question?

5 0
3 years ago
Huey has a fish tank that measures 5 feet long by 2 feet wide and 2 feet tall . The volume of the tank.
iris [78.8K]
This is a simple problem

First, take common sense and apply it here. The problem doesn't specifically tell you what the shape ACTUALLY is, but we can also apply what we know about geometry here, as well as what we know in general. Fish tanks most commonly come in 2 shapes: Square's and Rectangles. Fish tanks are what we call "3D" objects (meaning it's just not flat like a piece of paper", and the shapes are known as "Cubes and Rectangular Prisms".

Well, we know that squares/cubes have to have even sides. The problem states the tank is 5(l) by 2(w) by 2(h). This means it CAN'T be a cube, thus meaning it's a rectangular prism.

Now, to calculate volume, we have to know the formula. For this, the formula for volume is as follows: V=lwh
This means Volume=Length*Width*Height

So, do replace the words with what you know you already have. Let's make a list:
Length=5
Width=2
Height=2

V=lwh-----V=5*2*2

Now, work it out. 5*2=10*2=20, Left to right

Your answer here is V=20

~Hope this helps!
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3 years ago
What is HL?<br><br> HL =<br><br> (in the attachment)
Anuta_ua [19.1K]

Answer:

try 21

Step-by-step explanation:

if not im as stuck as you are :(

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3 years ago
Malaya is standing directly between a 90-foot tall courthouse and a 54-foot tall bank. If the angle of elevation from the point
Alex

Answer:

Step-by-step explanation:

Draw a picture.

c and b are Malaya’s distance from the courthouse and bank, respectively.

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tan(35°) = b/54

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= 90tan(72°) + 54tan(35°)

= 301.5 ft

3 0
2 years ago
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