Posted by **nicki** on Saturday, November 23, 2013 at 8:01am.

and I need help on this one problem

This homework question was removed due to a copyright claim submitted by the National Network of Digital Schools Management Foundation (NNDS).

would a graph model this problem situation?

- algebra 1 -
**Reiny**, Saturday, November 23, 2013 at 8:24am
Here is a graph of the situation.

http://www.wolframalpha.com/input/?i=plot+y%3D-0.05x+%2B+12+%2C+-40%3Cx%3C40

The way it is stated the equation makes little sense to me.

Is x the time relative to Sept 21 ?

Is -40<*<40 supposed to mean

-40 < x <40 ?

that is, are you going forward and backwards from Sept 1 only 40 days?

Yes, a graph would show the problem situation.

- algebra 1 -
**nicki**, Saturday, November 23, 2013 at 10:01am
what are the domain and range of the part of the function that is graphed previously?

- algebra 1 -
**nicki**, Saturday, November 23, 2013 at 10:02am
What is the meaning of the point x=-40 on the graph? Explain.

- algebra 1 -
**Reiny**, Saturday, November 23, 2013 at 11:34am
The domain is -40 < x<40

which I interpret at 40 days before Sept 21 and 40 days after Sept 21

(you do the counting)

the range would be ....

well if x = -40

y = -.05(-40) + 12 = 2+12 = 14

and if x = +40

y = -.05(40)+12 = -2+12 = 10

The numbers 14 and 10 would be the number of daylight hours 40 days prior to Sept 21 (in the summer) and 10 would be the number of daylight hours 40 days after Sept 21 (in winter)

- algebra 1 -
**malik**, Saturday, November 23, 2013 at 11:43am
so the range is 10?

- algebra 1 -
**Reiny**, Saturday, November 23, 2013 at 12:44pm
10 ????

How much spread is there between 10 and 14 ??

So , are you malik or nicki?

don't switch names.

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