nee5277 2 years ago Someone please help me to study for my test with this review packet!! :)

1. tictac4456

ill help or shall i say ill try

2. tictac4456

brb

3. nee5277

$5^{2}+7^{2}=x^{2} under that is, 25+49=x^{2}, below that is \sqrt{79}=\sqrt{x}^{^{2}} what does x^{2}=?$ & thanks ^.^

4. nee5277

I wish I could show a pic, it's Pythagonean and Theorem.

5. hartnn

you want to learn pythagoras theorem or u want to know how $$x=\sqrt{79}$$ ??

6. hartnn

and x^2 = 25+49 = 74

7. hartnn

not 79

8. nee5277

Sorry I meant 74, but I wanted to know the answer to it because there are 4 answers, 1)6.3 2)7.1 3)14.1 & 4)17.1

9. hartnn

then u need to post the entire question clearly....

10. hartnn

because sqrt 74 = 8.6

11. nee5277

The end of the dog's leash is attached to the top of a 5-foot-tall fence post, as shown in the diagram below (this is where the equation is) The dog is 7 feet away from the base of the fence post.

12. hartnn

|dw:1356724058436:dw| whats need to be found ?

13. hartnn

if x is to be found, its 8.6

14. nee5277

Okay thanks, how about the legs of an isosceles right triangle each measure 10 inches. WHat is the length of the hypothesis of this triangle, to the nearest tenth of an inch?

15. hartnn

again pythagoras theorem |dw:1356724579218:dw|

16. nee5277

Answers are 6.3,7.1,14.1, and 17.1 Would it be 14.1?

17. hartnn

yes :) did u understand how ?

18. nee5277

Lol no honestly, I need help, it was just a lucky guess for me because I knew the answer had to have a four in it right?

19. hartnn

For any right angled triangle, |dw:1356724844491:dw|

20. hartnn

did u get that ?

21. hartnn

u had a=b=10 $$c^2=10^2+10^2=200 \\ c=\sqrt{200}=14.1$$

22. hartnn

which part u have doubt with ??

23. nee5277

Oh okay I see now thanks :) What is the value of x? $13x-2(x+4)=8x+1$

24. nee5277

25. nee5277

Then add 2x to both sides? 2x+2x, 2x+8x

26. hartnn

-2(4)=-8 and not +8

27. nee5277

I'm lost at this part 11x-2x+8=8x+1 +2x +2x 11x+8=10x+1 -10x -10x?

28. hartnn

sorry, got disconnected $$13x-2(x+4)=8x+1 \\ 13x-2x\large \color{red}{+8}=8x+1 \\11x+8=8x+1 \\ 11x-8x =1-7 \\ 3x=-6 \\x=....?$$ ask if there is any doubt in any step...

29. nee5277

I get it so the answer would be 2?

30. nee5277

If 3(x+2)-2(x+1)=8 the value of x is? I need help pls.

31. hartnn

sorry, i did the same mistake again $$13x-2(x+4)=8x+1 \\ 13x-2x\large \color{red}{-8}=8x+1 \\11x-8=8x+1 \\ 11x-8x =1+8 \\ 3x=9 \\x=3$$

32. nee5277

It's okay :)

33. nee5277

would be 4 right?

34. hartnn

3(x+2)-2(x+1)=8 3x+6-2x-2=8 x+4=4 x=4 yes :)

35. hartnn

*x+4=8

36. nee5277

Wait for that last one wouldn't it be 2 because 3 goes into 6 twice?

37. Nimi404

Pls solve this someone has a container with 4200 millilitre of waters are in someone's container

38. hartnn

sorry, i didn't get your doubt ? 3x=9 so, x=3

39. nee5277

Oh oh I see sorry lol it looked like a 6 for a minute. thanks. How about Debbie solved a linear equation 3(x+4)-2=16 where did she make an error? Line 1: 3(x+4)-2=16 Line 2: 3(x+4)=18 Line 3: 3x+4=18 Line 4: 3x=14 Line 5: $4\frac{ 2}{ 3 }$

40. nee5277

Oops sorry Line 5 is suppose to say x= then what I put.

41. hartnn

3(x+4)=18 x+4 = 18/3 =6

42. hartnn

so, mistake in line 3, while distributing.

43. hartnn

if more Q coming up, then close this and ask it in a new post...

44. nee5277

Okay thanks.

45. hartnn

welcome ^_^