## anonymous one year ago Which expressions are equivalent to 4(4x + 2y + x − y)? 4(5x + 3y) and 20x + 12y 4(5x + y) and 20x + 4y 4(3x + y) and 12x + 4y 4(3x + 3y) and 12x + 12y

1. anonymous

idk how to do this

2. anonymous

yea I am pretty bad myself

3. anonymous

4. anonymous

@pooja195 @math1234

5. anonymous

6 (advanced) I do mostly 8th or 9th tho

6. anonymous

@horsegirl27 @HelpOfTheGods @Wolverine32 @omgitsjc

7. anonymous

The first expression on the left just requires you to combine the like terms on the inside of the parentheses.

8. anonymous

That would be$4x + 2y +x - y = (4+1)x + (2-1)y = 5x + y$

9. anonymous

10. anonymous

Correct.

11. anonymous

Yay! can you help with another?

12. anonymous

Sure

13. anonymous

What is the value of fraction 1 over 3x3 + 5.2y when x = 3 and y = 2? 13.4 16.4 19.4 28.4

14. anonymous

|dw:1435178251784:dw|

15. anonymous

Is this the expression? $\frac{ 1 }{ 3x^3 + 5.2y }$

16. anonymous

Oh ok

17. anonymous

Well, you just need to plug in those values of x and y.

18. anonymous

?

19. anonymous

$\frac{ 1 }{ 3 } \times 3^3 = 3^2 = 9$

20. anonymous

That's the first term. Then you need to compute$5.2 y = 5.2 \times 2 = 10.4$

21. anonymous

22. anonymous

$1/3x^3 + 5.2y$

23. anonymous

thats teh equation its not 1/3 times 3^3

24. anonymous

Oh is it $\frac{ 1 }{ 3x^3 }$ ?

25. anonymous

yes

26. anonymous

$\frac{ 1 }{ 3 }x^3 + 5.2y$

27. anonymous

if x = 3 and y=2 what is te answer?

28. anonymous

Ok if the expression is $\frac{ 1 }{ 3 } 3^3 + 5.2 \times 2 =$

29. anonymous

Then its, 9 + 10.4 = 19.4

30. anonymous

Need help on any more?