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3 years ago

What relations are functions

Mathematics

1 answer:

Inessa05 [86]3 years ago

6 0

The requirement is that every element in the domain must be connected to one - and one only - element in the codomain.

A classic visualization consists of two sets, filled with dots. Each dot in the domain must be the start of an arrow, pointing to a dot in the codomain.

So, the two things can't can't happen is that you don't have any arrow starting from a point in the domain, i.e. the function is not defined for that element, or that multiple arrows start from the same points.

But as long as an arrow start from each element in the domain, you have a function. It may happen that two different arrow point to the same element in the codomain - that's ok, the relation is still a function, but it's not injective; or it can happen that some points in the codomain aren't pointed by any arrow - you still have a function, except it's not surjective.

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Write the following using algebraic notation, using the letter x for any unknown numbers:

Mnenie [13.5K]

Answer:

$\dfrac{x+7}{5}$

Step-by-step explanation:

The given statement is "I think of a number, add seven then divide by five".

Let the unknown number be x.

Now, add 7 to the number = x+7

If we divided them by 5, $\dfrac{x+7}{5}$ .

So, the required algebraic notation is $\dfrac{x+7}{5}$ .

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2 years ago

if a tree casts an 8 meter shadow, and the angle from the ground to the tree is 30 degrees, what is the approximate height of th

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2 years ago

What is an equation of the line that passes through the points (-8, 1) and(7,1)?

likoan [24]

Answer:

y=1

Step-by-step explanation:

you can use those points to find the slope

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Hope this helps! :)

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2 years ago

Read 2 more answers

Y+ 2 = -8<br><img src="https://tex.z-dn.net/?f=%20%20%5Cfrac%7By%7D%7B5%7D%20%2B%202%20%3D%20%20-%208" id="TexFormula1" title="

yKpoI14uk [10]

Answer:2

Step-by-step explanation:

idek

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2 years ago

Point R is located between points Q and S. Point R is located at (3, 2) and point S is located at (8, 15). If R is the midpoint,

Lubov Fominskaja [6]

Answer:

(5.5,8.5)

Step-by-step explanation:

(8+3)÷2=5.5

(15+2)÷2=8.5

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2 years ago