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Stella [2.4K]
3 years ago
10

Which function has an inverse that is a function?

Mathematics
1 answer:
viva [34]3 years ago
8 0
1. y = x^2 +3 
x = y^2 +3
x - 3 = y^2
y = + or - √(x-3) not a fction

2. y = 0x -9
x = 0y -9
x = -9 not a fction

3. y = -7x
x = - 7 y 
y = - x/7 yes function

4. y = |x|
x = |y|
y= x,-x not a function
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The question means that when the number is 1 more than a multiple of 4 and two more than a multiple of 5. Write out multiples of 4 with one added on to them.
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Then write out multiples of 5 with one added on to them
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3 years ago
What is the factorization of 49b2 − 81?
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Step-by-step explanation:

The factorisation of 49b^2 - 81 is (7b - 9)(7b + 9). This is because 49 and 81 are the squares of 7 and 9 respectively, so these must be multiplied together. b^2 is b x b. Finally, it must be -9 and +9 to make -81, because when the signs are the same the result is a positive number

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John needed 13.71 feet of wire to fix a lamp. He bought 14□(1/2) feet of wire at the hardware store. How much wire did he have l
GrogVix [38]

Answer:

John would have 0.79 feet of wire left over after fixing the lamp

Step-by-step explanation:

Given:

Length of the wire John needed for fixing the lamp = 13.71 feet

Length of wire John bought from the hardware store = 14\frac{1}{2}

To Find:

Length of wire left with John after fixing the lamp = ?

Solution:

Lets first convert the mixed fraction into decimal form

14\frac{1}{2}

=> \frac{2 \times 14 +1}{2}

=>\frac{29}{2}

=> 14.5

So John Bought 14.5 feet of wire

Now

let the wire that is left with John after Fixing the lamp be X

Then,

X = length of wire john bought - Length of wire needed for fixing the lamp

X=  14.5  -   13.71

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4 years ago
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