PLEASE HELP

The number (in thousands) of DVD players sold in the united states from 1998 to 2003 can be modeled by f(x)=4250x+330 where x is the number of years since 1998.

a. Graph the function and identify its domain and range.
b. find the value of x fir that f(x)=13,080. explain what the solution means in this situation.

Question

PLEASE HELP

The number (in thousands) of DVD players sold in the united states from 1998 to 2003 can be modeled by f(x)=4250x+330 where x is the number of years since 1998.

a. Graph the function and identify its domain and range.
b. find the value of x fir that f(x)=13,080. explain what the solution means in this situation.

cathyangs · Answer

1) What do you need help with? Part A or B and in what capacity?
2) is "salutation" in part B supposed to be "calculation"?

anonymous · Answer

so sorry! 

i need help with a and b and the part in b is suppose to be solution :P

cathyangs · Answer

For A, do you have graph paper on hand or are you using something online/digital? Make your y axis 0 to 26,000 or so. trust me. You could make each block worth 1,000 on one sheet of paper, probably. 

I would plot the y-intercept at first. This is the value of y when x=0. Let me know when you've got this far.

anonymous · Answer

okay, I've done that..

cathyangs · Answer

Next, the slope of the graph corresponds to how much change there is in the y direction over a change in the x. In your problem, is it the change in the number of DVDs sold over the number of years that have passed. So for 1998, 0 years have passed since 1998, so x=0. For 1999, 1 year has passed since 1998, and x=1. Can you figure out what y would be for x=1? You can then use the fact that 2003 is N years after 1998 to find the number of DVDs sold where x=N. Let me know if this makes sense and when you've gotten this far.