web2.0calc
 
+0  
 

 For the period 1985 - 2001, the number y (in millions) of cell phone service. PLEASE HELP!

-5
1044
3
avatar+73 

For the period 1985 - 2001, the number y (in millions) of cell phone service subscribers in the U.S. can be modeled by the function y = 0.7x^2 - 4.3x + 5.5 where x is the number of years since 1985. In what year were there 16,000,000 cell phone service subscribers? 

 Apr 12, 2018
edited by GAMEMASTERX40  Apr 12, 2018

3+0 Answers

 #1
avatar+128408 
+2

Here again, GM....a graph might be the best way to go

 

y  = 0.7x^2 - 4.3x + 5.5

 

See the graph, here :

 

https://www.desmos.com/calculator/gguuvypnfx

 

This occurs in about the 8th year after 1985    [ in 1993 ]

 

 

cool cool cool

 Apr 12, 2018
 #2
avatar+73 
-4

Thanks CPhill! (call me Rick)

 Apr 12, 2018
 #3
avatar+128408 
+1

OK, Rick  !!!!

 

[ You may have to remind me of your name from time-to-time  !!! ]

 

cool cool cool

CPhill  Apr 12, 2018

3 Online Users

avatar
avatar
avatar

Top Users

avatar+128408 CPhill moderator
avatar+118608 Melody moderator
avatar+33615 Alan moderator
avatar+14903 asinus moderator
avatar+9519 MaxWong
avatar+3144 admin administrator
avatar+2440 GingerAle
avatar+1763 tomtom
avatar+1465 bader
avatar+1037 parmen
avatar+1030 blackpanther

Sticky Topics