## anonymous one year ago The expression to find the perimeter of a rectangle is 2(length + width). What is the perimeter, in units, of a rectangle of length fraction 1 over 7 unit and width fraction 1 over 2 unit? fraction 1 and 1 over 7 units fraction 1 and 2 over 7 units fraction 4 over 9 unit fraction 2 over 9 unit

1. anonymous

@UsukiDoll

2. anonymous

@UsukiDoll

3. phi

length is 1/7 width is 1/2 can you add those two fractions?

4. phi

$\frac{1}{7}+ \frac{1}{2}$ use 14 as the common denominator

5. UsukiDoll

Perimeter = 2L + 2W let l = 1/7 and w = 1/2 Perimeter =$2(\frac{1}{7})+2(\frac{1}{2})$

6. anonymous

ya

7. UsukiDoll

ok then multiply first.

8. anonymous

multiply what

9. UsukiDoll

2 x 1/7 + 2 x 1/2

10. UsukiDoll

what is 2 x 1/7 what is 2 x 1/2

11. UsukiDoll

|dw:1437738157402:dw|

12. anonymous

0.285714285714

13. anonymous

for the first one

14. anonymous

2 x 1 over 2 is 1

15. UsukiDoll

ok... tip: keep your result in fraction form because decimals are nasty

16. anonymous

i used calculator

17. UsukiDoll

|dw:1437738291917:dw|

18. UsukiDoll

not a good idea to use calculator... I know universities that ban them .

19. UsukiDoll

anyway we take the LCD because we have one fraction and one whole number

20. UsukiDoll

|dw:1437738349274:dw|

21. anonymous

yes

22. UsukiDoll

so it's just what's 2 +7 you'll get the numerator

23. anonymous

9

24. UsukiDoll

yeah so the perimeter is 9/7

25. anonymous

$4\over9$

26. anonymous

for the firdt one

27. anonymous

first

28. UsukiDoll

what is this?

29. UsukiDoll

oh ... I see your choices are in mixed fraction form . we just have to adjust 9/7 because it's improper

30. anonymous

yup

31. UsukiDoll

|dw:1437738535938:dw|

32. UsukiDoll

though both versions are right XD

33. anonymous

there is one more

34. UsukiDoll

open a new question XD