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Mnenie [13.5K]
3 years ago
10

PLZ HELP ME QUICKLY!!!!!!!!!!

Mathematics
1 answer:
BARSIC [14]3 years ago
3 0
(1/3) bag = (1/4) lb.
multiply by 3 on both sides to get 1 full bag.
3(1/3)b = 3(1/4)
1 bag = (3/4) lb.
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What mixed number is equivalent to 18/8
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The mixed number to 18/8 is 2 and 1/4
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The 2 will be your whole number 
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Can y’all do 1-2 I’ll give brainliest !!!
Svet_ta [14]

One to one or injective means that each x in the domain maps to a unique y, i.e. the function preserves distinction.

y=(x-1)/(3x+3) is one to one.  We can solve for x:

3xy + 3y = x - 1

3y + 1 = x - 3xy = x(1-3y)

x = (3y+1)/(1-3y)

That proves it's one-to-one; for each y we get one x.

y=\sqrt{5x+9}

That's also one to one,

y^2 = 5x+9

x = \frac 1 5 (y^2 - 9)

That's the proof.

f(x)=\dfrac{7}{4x^2}

That's Not one-to-one

because f(-x)=f(x).  We only need a single counterexample; f(1)=7/4, f(-1)=7/4

f(x) = \frac 1 2 x^3

That's one-to-one, textbook case

f(x)=3x^4 + 7x^3

That's not one-to-one because the fourth power dominates so this will be sort of parabola-ish, repeating the same big positive values for a negative and positive x.

--------------

y = f(x) = \sqrt[3]{x-2} + 8

y - 8 = \sqrt[3]{x-2}

(y-8)^3 = x-2

x = (y - 8)^3 + 2

f^{-1}(x) =(x - 8)^3 + 2

First choice


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