## anonymous one year ago I need help with this question. It is similarity

1. anonymous

2. anonymous

question 3

3. anonymous

the answer for 3a. is 15:16, 225:256

4. anonymous

and for 3b. 1:20, 1:400

5. anonymous

$\frac{ 7 }{ 0.875 } = \frac{ x }{ 0.7 }$

6. anonymous

where did u get 0.7

7. anonymous

oh wait i did your question 4

8. anonymous

lel

9. anonymous

oh its only questions 3

10. anonymous

This is wat i did, but it is not the same as the answer

11. anonymous

because $(\frac{ 0.875 }{ 7 } ) ^3 = \frac{ 1 }{ 512 }$

12. anonymous

where did u get 512

13. anonymous

calculator

14. anonymous

0.875 divide by 7 then cube

15. anonymous

ohhh

16. anonymous

but why do i need to do that

17. anonymous

you did your$(\frac{ s_1 }{ s_2 })^3$the wrong way

18. anonymous

how can$(\frac{ 0.875 }{ 7 })^3 = 1/2$

19. anonymous

no i want to find the ratio for the sides which is s1/s2

20. anonymous

so I cube root the volume

21. anonymous

i know but you made a calculation error there

22. anonymous

but $\sqrt[3]{\frac{ 0.875 }{ 7}} = \frac{ 1 }{ 2}$

23. anonymous

yup

24. anonymous

then why is it a calculation error

25. anonymous

i thought you cube that 0.875/7

26. anonymous

ohhhh

27. anonymous

anyways so I found the ratio of a side on the smaller solid to the corresponding side on the larger solid which is 1:2 but the answers say that it is 15:16

28. anonymous

they are asking for ratio of surface area

29. anonymous

not ratio of sides

30. anonymous

weird stuff!

31. anonymous

it says to do both

32. anonymous

if the ratio of side is 15/16 then ratio of area is (15/16)^2

33. anonymous

why?

34. anonymous