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anonymous

  • one year ago

Please help! Use △DEF, shown below, to answer the question that follows: What is the value of x rounded to the nearest hundredth?

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    @phi You there?

  3. phi
    • one year ago
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    for the angle at D, which trig function should we use ?

  4. anonymous
    • one year ago
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    I think it should be the sin function? Because x is the adjacent.

  5. phi
    • one year ago
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    people use SOH CAH TOA to remember or oscar had a heap of apples sin cos tan

  6. anonymous
    • one year ago
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    Oh okay, well for this triangle, I think we should use sin because the Hypotenuse is 55 degrees and the Opposite is x which and we're also given the degrees for sin when it's being put into a fraction.

  7. phi
    • one year ago
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    side x is the adjacent side for angle D

  8. anonymous
    • one year ago
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    Oh, sorry, now I see. I was looking at it a different way. So then we'd use the cos function.

  9. phi
    • one year ago
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    yes, cos. and sides are lengths (and measured in for example, feet, inches, meters, miles, *not* degrees) angles are measured in degrees or radians

  10. anonymous
    • one year ago
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    |dw:1440787209071:dw|

  11. anonymous
    • one year ago
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    This is what it would look like yes?

  12. phi
    • one year ago
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    yes. multiply both sides by 55 and you get x= 55 cos(49) we now need a calculator.

  13. anonymous
    • one year ago
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    Okay, so in my calculator I punched in 55 and then cos and it gave me: 0.5735. Then after that the new fraction would be: 0.5735 = x/55 Then, I'd take 55 and multiple it by 0.5735 and it'd give me: 31.54 which will equal x. For the next step it tells me to round to the nearest tenth which will give me: 32?

  14. anonymous
    • one year ago
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    Oh wait, I think I was supposed to do 49 cos, not 55.

  15. phi
    • one year ago
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    you ended up doing cos 55 try 55 times cos 49 enter

  16. anonymous
    • one year ago
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    Oh okay, it gave me: 36.08 This question doesn't have multiple choices, I got 36 last time and punched it in the answer box and it told me it was wrong.

  17. phi
    • one year ago
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    yes it wants x rounded to the nearest hundredth so 36.08

  18. anonymous
    • one year ago
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    Hm, I'll try 36 again and then tell you what I got.

  19. phi
    • one year ago
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    it wants it rounded to the nearest 100th. 36.08 if it won't take that, make a note and tell your teacher about it.

  20. anonymous
    • one year ago
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    This is what is says: "Type the numeric answer only in the box below."

  21. phi
    • one year ago
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    Use △DEF, shown below, to answer the question that follows: What is the value of x rounded to the nearest hundredth?

  22. anonymous
    • one year ago
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    It says numerically, so that's why I put 36 as my answer. But I can try 36.08

  23. phi
    • one year ago
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    numeric means "number" and 36.08 is a number this is instead of , for example, 55*cos(49) which is more accurate (because we do not round), but obviously it is not a simple number

  24. anonymous
    • one year ago
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    Okay, I will put 36.08. Thank you for your help!

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