Sign Up FREE!  Sign In  Classroom Setup  Common Core Alignment  
04222011  #1 
Join Date: Apr 2011
Posts: 1

Teach me! :)
Hi
Okey i have some problems with basic pretty basic maths. If some one could give me step by step (and even better comment why) for my couple problems that would be pretty sweet. First one is: 5x + (7x + 2) = 3(2x + 4)  (2x + 2) im pretty blocked here... i know i should first open the () first, if its 3(2x plus 4) its: 3x2 plus 3x4 = 6 plus 12 = 18? or im lost right away? lol and if its ( then opened by turning numbers upside down? Second: Lets say if year 1995 population ZumbaZumba is 19% was under 15years old. Year 2005 population under 15 was 17,3%. How big % chance it was? How to solve this? and again step by step would be nice with small comments 
04242011  #2 
Join Date: Mar 2005
Posts: 10,648

5x + (7x + 2) = 3(2x + 4)  (2x + 2)
First, use the distributive property to simplify the equation. 5x + 7x + 2 = 6x + 12 2x  2 Next, combine like terms. 12x + 2 = 4x + 10 Then, isolate the variable x. 8x = 8 Finally, solve for x. x = 1 If you would like to see all the steps, check out http://www.algebrahelp.com/calculators/equation/
__________________
Do Math and you can do Anything! 
Thread Tools  
Display Modes  

