jessie13 one year ago Will Medal!Answer ASAP!! 1: All of the following expressions are equivalent except _____. 7 - x x - 7 - x + 7 7 + (- x) 2: Solve -16x = -80. -96 -64 -5 5 3: The solution to -45 = n/5 is _____. -9 9 225 -225

1. jessie13

@phi

2. anonymous

1.c

3. anonymous

2.d

4. jessie13

do u know the last one? and what grade are u in?

5. anonymous

I'm in 9th but no I don't know

6. jessie13

oh okay but thanks any way?

7. phi

Can you answer #1 ? do any look like they are the same expression (written in different ways) ?

8. jessie13

D

9. phi

you should know that you can change the order of when adding x+ -7 is the same as -7+ x and putting in parens suchas (-7) + x does not change it.

10. phi

all the choices have +7 and -x being added except for one of the choices that adds -7 and +x

11. jessie13

ok

12. jessie13

but did @cool4u2001 get the answers right?

13. phi

in Q1, which choice has a -7 in it ?

14. jessie13

b

15. phi

notice none of the other choices have -7 b is the "different" one

16. jessie13

oh! so b is right?

17. phi

yes, b for Q1 for Q2, what is -16* 5 ?

18. jessie13

-80

19. phi

so -16*5 = -80 -16*x = -80 x must be what ?

20. jessie13

5

21. phi

so d is the answer for Q2 btw, you find x by starting with -16 x = -80 divide both sides by -16 x= -80/-16 = 5

22. phi

Q3 does not make sense. It looks like something was left out.

23. jessie13

i fixed it!

24. jessie13

all i know about it is that its not A

25. jessie13

@phi

26. jessie13

@phi

27. phi

multiply both sides by 5

28. jessie13

what do u mean?

29. phi

$-45\cdot 5 =\frac{ n}{5} \cdot 5$

30. phi

on the right side 5/5 simplifies to 1 and 1*n is just n you get -45*5 = n

31. jessie13

-225?

32. phi

yes

33. jessie13

okay thanks for helping me!!!!

34. phi

yw

35. jessie13

thank so much i got 100%!!!!

36. jessie13

@phi