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3 years ago

Are these functions?

Mathematics

2 answers:

OlgaM077 [116]3 years ago

7 0

Answer:

Relation 1 : Not a function

R2 : Function

R3: Function

R4: Not a function

storchak [24]3 years ago

4 0

You really should learn what a function is. It will help you in most of your future math courses.

(input, output) = (domain, range)

An input CANNOT go to two different outputs. This is not a function.

If the output is repeated, no problem. It is still a function but not ONE-TO-ONE.

Relation 1 is not a function because -7 goes to three different outputs.

Relation 2 is not function because cloud goes to two different outputs. Cloud is mapped to -6 and 6. Not a function.

Relation 3 is a function but it is not ONE-TO-ONE. Do you know why based on what I said above?

Relation 4 is not a function because -9 goes to two different outputs.

Understand?

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Fill in the missing number in this newspaper report:

natka813 [3]

Answer:

£125000

Step-by-step explanation:

Original cost of house = £100 000

Percent increase = 25%

Increase in price = 25% of 100,000

Increase in price = 0.25 * 100,000

Increase in price = 25000

New cost = original cost + Increment

New cost = 100,000 + 25,000

New cost = 125,000

Hence it now cost £125000

8 0

2 years ago

Hi<br> Someone that is able to do it

VARVARA [1.3K]

I think it’s b

Not for sure but it makes the most sense

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2 years ago

Prove that if r is any rational number, then 3r2 − 2r + 4 is rational. The following properties may be used in your proof. Prope

ziro4ka [17]

Given:

Expression is

$3r^2-2r+4$

To prove:

If r is any rational number, then $3r^2-2r+4$ is rational.

Step-by-step explanation:

Property 1: Every integer is a rational number. It is Theorem 4.3.1.

Property 2: The sum of any two rational numbers is rational. It is Theorem 4.3.2.

Property 3: The product of any two rational numbers is rational. It is Exercise 15 in Section 4.3.

Let r be any rational number.

We have,

$3r^2-2r+4$

It can be written as

$3(r\times r)-2r+4$

Now,

3, -2 and 4 are rational numbers by property 1.

$r^2=r\times r$ is rational by Property 3.

$3r^2\text{ and }-2r$ are rational by Property 3.

$3r^2+(-2r)+4$ is rational by property 2.

So, $3r^2-2r+4$ is rational.

Hence proved.

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2 years ago

Is 26 divisible by 2

sergij07 [2.7K]

Yes because 26 is an even number

3 0

3 years ago

Read 2 more answers

The length of a rectangle is 1 inch less than twice the width. the area is 21 inches^2 what is the length?

ale4655 [162]

Hi.

Formula for area: A = 2l + 2w, where l is the length and w is the width.

Given information:
• l = 2w - 1
• A = 21 in^2

We can plug in our values accordingly and solve for w.

A = 2l + 2w
21 = 2(2w - 1) + 2w
21 = 4w - 2 + 2w
23 = 6w - 2
23 = 6w
3.83 = w

Plug 3.83 for w into 2w - 1 to find length.

2(3.83) - 1
7.66 - 1
6.66

Finally, check your work by plugging your values into the original equation.

21 = 2(6.66) + 2(3.83)
21 = 13.32 + 7.66
21 = 20.98

Answer:
The length is approximately 6.66 inches.

4 0

3 years ago