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leva [86]
3 years ago
8

Help me I dunno know.

Mathematics
1 answer:
k0ka [10]3 years ago
4 0

There is a rule:

One input(x-value) can only have one output(y-value) in order to be a function.

If one input has more than one output, it is not a function.

(This doesn't apply to outputs, one output can have more than one input and still be a function)

The 1st option is not a function because the inputs 9 and 10 have more than one output.

The 2nd option is not a function because the input 3 has more than one output.

The 3rd option is a function because each input only has one output.

The 4th option is not a function because the input 5 has more than one output.

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sergij07 [2.7K]

Answer:

B 10x+5

Step-by-step explanation:

:)

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3 years ago
Predict the number of students out of 400 that would pick science as there favorite subject
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I would have to say 30%
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An arc of length 8 in. is intersected by a central angle in a circle with a radius of 3 in. What is the measure of the angle? Ro
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7 0
3 years ago
PLEASE HELP!!!!
wel

Answer:

Mike is not right

Step-by-step explanation:

we know that

If two figures are similar, then the ratio of its surface areas is equal to the scale factor squared

Let

z----> the scale factor

x----> surface area of the enlarged rectangular prism

y-----> surface area of the original rectangular prism

z^{2}=\frac{x}{y}

so

In this problem we have

z=2

substitute

2^{2}=\frac{x}{y}

4=\frac{x}{y}

x=4y

so

The surface area of the enlarged rectangular prism is 4 times the surface area of the original rectangular prism

therefore

Mike is not right

<em>Verify with an example</em>

we have a rectangular prism

L=5\ m

W=2\ m

H=3\ m

The surface area of the prism is equal to

SA=2(LW)+(2L+2W)H

substitute the values

SA=2*(5*2)+(2*5+2*2)*3=62\ m^{2}

If he doubles each dimension of any rectangular prism

then

the new dimensions will be

L=5*2=10\ m

W=2*2=4\ m

H=3*2=6\ m

The new surface area will be

SA=2*(10*4)+(2*10+2*4)*6=248\ m^{2}

248/62=4

therefore

The surface area of the enlarged rectangular prism is 4 times the surface area of the original rectangular prism

8 0
3 years ago
How do you start off a math question with parenthesis?
Nataly [62]
You first do the equation in the parenthesis, Then, do all else using PEMDAS
7 0
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