## hihi67 4 years ago i have some algebra equations that i have done. can you check them? (i will post them soon).

1. hihi67

a) k/3 + k/2 =

2. hihi67

b) 4/5 x - 1/10 x

3. hihi67

c) 3/8 z - 1/4 z + 1/2 z

4. hihi67

d) s/5 - s/3 + s

5. hihi67

e) 1 1/2 m - 3/4m + m/8

6. hihi67

and.....

7. hihi67

f) -4a/5 + 1/10a - 3a

8. hihi67

tell me what answers you get, and then i will see if i have the same. pleasee....?

9. agreene

a) $\frac{5k}6$ b) $\frac7{10x}$ c) $\frac5{8z}$ d) $\frac{13s}{15}$ e) $\frac{m}{8}-\frac{1}{4m}$ f) $\frac1{10a}-\frac{19a}5$

10. hihi67

okay... well for a b and c i have the same. for d i have - 17/15s. for e i have 6/8m. for f i have - 3 and 9/10a

11. hihi67

this is how i figured it out. d:

12. agreene

from d down it was a bit hard to know what the question was--since you didn't use parenthesis.

13. hihi67

no () in book either.

14. hihi67

ust a min.

15. agreene

d could have been: $\frac{s}5 - \frac{s}3 + s$ which is what i assumed, or $\frac{s}5-\frac{s}{3+s}$ which would be a harder problem, lol

16. hihi67

$s/5 - s/3 + s : \space \space \space \space \space \space \space \space \space s-5-s/3 = 3s/15 - 5s/15 \space \space \space that equals -2s/15 \space \space \space \space \space -2s/15 + s =$

17. hihi67

thats d

18. hihi67

dang cant see it.

19. hihi67

never mind...

20. hihi67

bye thanks

21. agreene

lol dont give up so quickly :P

22. hihi67

ooooh I KNOW!

23. hihi67

stupid "order of operations"

24. hihi67

yep, thanks! you really actually did help a lot!!!

25. agreene

for d: I find it easier to start by factoring out the variables (makes it easier for me to see): s/5 - s/3 +s $\frac15(s) - \frac13(s)+ s$ combine your fractions: $-\frac2{15}(s)+s$ combine those fractions (convert the +s to +15s/15 so its the same denominator) $\frac{15}{15}(s) - \frac2{15}(s) = \frac{15-2}{15}(s)==\frac{13}{15}(s)$ or $\frac{13s}{15}$ thats how I like to work these, of course--if your way is easier for you and works, do that!

26. hihi67

you are very much a genius. that really helps!!!! you should become my math teacher!

27. hihi67

hah

28. hihi67

29. hihi67

e is 7/8m

30. hihi67

because: 1 1/2m is 3/2m and 3/4 m, normal. m/8 = 1/8 times m. 3/2 time m - 3/4 times m is 3/4 times m. 3/4 time m - 1/8 times m is 7/8

31. agreene

Its a little bit harder, but: I'd start by converting that mixed fraction in the front, 1 1/2 = 3/2 so 1 1/(2m) = 3/(2m) that gives us: $\frac3{2m}-\frac3{4m}+\frac{m}8$ convert that 2m denominator to 4m by multiplying 2/2 through it: $\frac6{4m}-\frac3{4m}+\frac{m}8$ 6-3 = 3 so: $\frac3{4m}+\frac{m}8$ although you can simplify this a bit, id leave it there and call that my answer.

32. hihi67

okay..

33. hihi67

what i dont get, is f) how is -4a/5 + 1/10 a is -7/10a. its -9/10a!!!

34. hihi67

i solved it right, but for some reason i keep getting -9/10.

35. hihi67

which is sad, cause i should know how to solve that.

36. agreene

combining $\frac{-4a}5+\frac1{10a}$ is a bit tricky, in fact in my first answer, i didn't even do it. the reason is the variable is in the numerator of one and the denominator of the other... if you would like to do it, remember you need to multiply through and get the same denominator... in this case: 10a is what we need. 5 is what we have, so we need to multiply through 2a to the fraction on the left: $\frac{-4a}{5}*\frac{2a}{2a}+\frac1{10a}$ $\frac{-8a^2}{10a}+\frac1{10a}$ now we can combine these two, since they have the same denominator: $\frac{1-8a^2}{10a}$

37. hihi67

oh. i just did 5 * 2 is 10. -4a * 2 is 8!

38. agreene

yeah this one is a bit more tricky :P

39. hihi67

okay. thank!

40. hihi67

you

41. hihi67

bye now!