MATHEMATICS HIGH SCHOOL

70 points.Select the correct answer.
Which relation is a function?
(Look at the photo)

Option D didn’t fit in the photo, so here’s it typed out.

x | y
10 15
20 25
8 30
20 35

Answers

Answer 1

Answer:

Answer:

Option A

Step-by-step explanation:

Options B, C and D have repeat x-values with different y-values.

The relationship is many-to-one.

If graphed, those point appear on a vertical line.

Option A has one-to-one relation, so is the only functional relationship

Answer 2

Answer:

Answer:

A is a function.

Step-by-step explanation:

All the others are one-to-many relations.

For example in B, 3 maps to 10 and also maps to 30 ( one - to - many).

A function is a one-to-one or many-to-one mapping.

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Determine if the equation y = 2.5(0.8)^x represents exponential growth or decay?

a spinner is divided into 8 equal sections. 5 sections are red and 3 are green. if the spinner is spun 3 times, what is the probability that it lands on red exactly twice?

Answers

Your gonna wanna multiple (5/8)(5/8) which is 25/64 or about 39 percent. (I might not be entirely right, sorry. )

Answer:

(A) green and grey

Step-by-step explanation:

They both have a 2/8 chance therefore having the same probability

How to expand and simplify (2x+3y)(x-y)

Answers

(2*x+3*y)*(x-y) this is expanded form

Multiply (2x)(x-y). Then Multiply (3x)(x-y). After that, you have to add the two. If you want it to be simplified, add the x together, and then add the y together. :)

What fraction is the same as seven tenths

Answers

Any fraction of the form 7n/10n where n∈Z.

E.g.14/20, 49/70, 700/1000 etc.

$7/10=14/20=21/20\ and\ many\ more.$

Lisa purchased a prepaid phone card for $25. Long-distance calls cost $.21 a minute using this card. Alyssa used her card only wants to make a long distance call. If the remaining credit on her card is $20.59, how many minutes did her call last?

Answers

21 minutes
You have to take away 25-20.59 then divide the answer by 0.21

Alguém poderia me ajudar nessa questão a print está aí

Answers

Can you put that in English

What is the domain of the relation? {(−4.5, 0), (−3, 9), (0.9, 0), (4, −7.8), (4, 0), (17, 3)} {0.9, 4, 17}

{−7.8, 0, 3, 9}

{−4.5, −3, 0.9, 4, 17}

{−4.5, −3}