Question

What would the domain and range be?

Answer 1

doamin is the x in a graph, while the range would be the y

Answer 2

What would it be in the following attached docs?

Answer 3

use that. you have to answer the equations first.

Answer 4

This is what the problems looked like. And the ones I attached earlier are the answers.

Answer 5

the first numbers are x and the y are the last numbers

Answer 6

So what would it be?

Answer 7

I have graphed it and everything.

Answer 8

so you good?

Answer 9

No

Answer 10

u need domain and range of
P(s)=69.70s-1077
right?

Answer 11

Yes

Answer 12

what values can s take ? any ?

Answer 13

What do you mean?

Answer 14

is there any restriction on value of s ?

Answer 15

First I found P(0) which equals (0, -1077). Then I found P(s) which equals (15.45, 0)

Answer 16

Those are the two points. Now I have to graph it and then find the domain and range.

Answer 17

in order to make profit domain should be [16, max no of radio available]
correspondingly you can find range.

Answer 18

Wouldn't the domain be [0,-1077]?

Answer 19

lets say total no. of radio is a
your function is P(s)=69.70s-1077
values of s is the domain
at s=15.45 break even point occurs so at this point P(s)=0
But radio quantity is in integer so s=16. Nowo if he sells more than this only he will get profit i.e.,
[16 a]
at 16 P(s)=0 and at s=a, P(a), so range is [P(16) P(a)]=[0 P(a)]

Answer 20

Is it clear?

Answer 21

I don't get it.

Answer 22

:(

Answer 23

So would range be [0, 15.45]?

Answer 24

lets solve together. you start I'll correct you

Answer 25

I have already solved it earlier. [0, -1077] and [15.45, 0]

Answer 26

Now the directions say to graph these points and then determine the domain and range.

Answer 27

in that answer is correct your domain is (0 infinity) [all possibilities included]

Answer 28

So what's the range?

Answer 29

[-1077 infinity)

Answer 30

Okay so Domain is [0, infinity) and Range is [-1077, infinity). Correct?

Answer 31

yes

Answer 32

Why wouldn't the domain be [0, 15.45]?

Answer 33

first of all no. of radio cannot be 15.45

Answer 34

Nevermind, I got it. Can you help me with one more problem?

Answer 35

second during this part only loss will occur. what about the profits?
it will occur after your 15.45 so extend your range.
finally max. no. of radio are not given so infinite number can exist. therefore domain is
[0 infinity), not below zero as number of radio cannot be negative

Answer 36

Yea sure please ask. If I'll be able to help I'll surely do.

Answer 37

all parts?

Answer 38

Yes

Answer 39

a)
(8, 45.7), (11, 48.1)

Answer 40

Okay

Answer 41

Is (b) y = .8x+39.3 ?

Answer 42

you put the values of x and y in equation and solve it.
I haven't solved it. To check you got it right put the know value and check the answer

Answer 43

*known

Answer 44

m = 48.1-45.7/11-8 = -2.4/3 = .8

y-y1=m(x-x1)
y-45.7 = .8(x-8)
y-45.7 = .8x-6.4
y = .8x+39.3

Answer 45

yes. you got it.

Answer 46

put x=15 and obtain output

Answer 47

I got I = 51.3

Answer 48

so can you interpret the results?

Answer 49

"In 2015, PA's per capita income was $51.3 thousand." ??

Answer 50

will be

Answer 51

Okay

Answer 52

what about the trend?

Answer 53

I have no clue.

Answer 54

Initially in 2000, the income was 39.3 (your intercept). This per capita income increases unifomly, whose rate is given by the slope of the curve, which is 0.8.

Answer 55

and as the time will progress the per capita income will increase only. as per the equation, with increase in time it cannot decrease.

Answer 56

I hope you got it?

Answer 57

Yes, I got it.

Answer 58

:)

Answer 59

I need help with a few more whenever you're free.

Answer 60

ok no problem.

Answer 61

which part?

Answer 62

hey u thr? Is (a) solved.

Answer 63

No. Neither of them are solved. I don't understand any of the parts.

Answer 64

use this to solve (a) http://en.wikipedia.org/wiki/Simple_linear_regression

Answer 65

you need to fit the data given to a equation.

Answer 66

Okay

Answer 67

the line will be y=mx+c form.

Answer 68

find m first using the equations on web page(beta)
then find c( alpha on web page)

Answer 69

let me know when you got something.

Answer 70

Honestly, I have no idea how to do this.

Answer 71

giv me 5 min

Answer 72

see, t is years sine 2000. So subtract 2000 from years. You have 5, 7...11 as x. and ticket cost is y

Answer 73

now find the average of x and y separately.

Answer 74

got upto this?

Answer 75

How would I find the average of x and y?

Answer 76

sum all numbers of x and divide by total number of values of x, similarly for y

Answer 77

use this it will help http://www2.isye.gatech.edu/~sman/courses/6739/SimpleLinearRegression.pdf

Answer 78

on page 9 formula are written use them.