anonymous
  • anonymous
Given 2w = -7z. Solve for w
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
Given 2w = -7z. Solve for w
anonymous
  • anonymous
Divide both sides by 2 and you will have w :)
anonymous
  • anonymous
Assuming that your problem is 2w = -7z. I'm not sure what you put in the first post.

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anonymous
  • anonymous
|dw:1446360673388:dw|
anonymous
  • anonymous
The answer should be -7z/2. When I divided both sides by 2 I got -3.5. :(
anonymous
  • anonymous
You forgot the z. When you divide by 2, the z doesn't go away. w = (-7/2)z = -3.5z
anonymous
  • anonymous
According to the practice test answers - it is supposed to be -7z / 2 and I have been trying to figure out how this answer comes out
anonymous
  • anonymous
Get a calculator - plug in (-7/2) and let me know what you get.
anonymous
  • anonymous
-3.5
anonymous
  • anonymous
Exactly -- they're the same thing. The solution left it in a fraction, but -3.5z is the same thing. Both are correct answers. However, if your teacher wants you to leave it in a fraction, then leave it as (-7/2)z. If your teacher says simplify as a decimal, then simplify it to -3.5z. If they don't specify, then they more than likely won't care what form it's in, okay?
anonymous
  • anonymous
Great.. My last problem unsolved is solve : 20 -15 / (-5). (The answer should be 23)
anonymous
  • anonymous
Okay, so I'm assuming then that the format is: \[\large 20-\frac{15}{(-5)}\] Sometimes it can get confusing when it's typed in simple text. If what I have is correct, then yes, 23 is the answer. Whenever we divide by a negative, it's the same as if the negative is on top, ok? So \[\huge 20-\frac{ -15 }{ 5 }=20--3=20+3=23\] Make sense?
anonymous
  • anonymous
The following formula relates three qualities: distance (d), rate (r), and time (t) d=rt Solve this for t (t=d/r) how do you write this out?
anonymous
  • anonymous
It's already written out for you. So if you have d = rt, you see that the r and t are multiplied. How do you get rid of the r on the right side?
anonymous
  • anonymous
Hint: it's the same process that we used for your first question all the way at the top
anonymous
  • anonymous
dividing both sides by 2?
anonymous
  • anonymous
t would = d/r
anonymous
  • anonymous
travel = distance / rate
anonymous
  • anonymous
b) if the distance is d=300 miles and the rate is r=60 mph, find the time, t (5 hours)
anonymous
  • anonymous
and c) If the distance is d = 250 miles and the time is t = 4.5 hours, find the rate, r. ( 55.56 mph)
anonymous
  • anonymous
for b). It gives you d and r. You already said that t = d/r so just plug it in :) for c). You need to solve for r instead! So instead of getting t by itself, you need to get r by itself.
anonymous
  • anonymous
Ok with b) I got 300 divided by 60 = 5 ( t = d/r)
anonymous
  • anonymous
Yep! Sounds good to me
anonymous
  • anonymous
For c how do I write this one out d=rt? 250=55.56*4.5
anonymous
  • anonymous
We said that d = rt, so to get r by itself, we must divide by t this time. Therefore, r = d/t. Plug in the two numbers it gave you for d and t and you'll have your rate!
anonymous
  • anonymous
d = 250 / t 4.5 = 55.55 r = 55.56
anonymous
  • anonymous
r = 55.56 mph
anonymous
  • anonymous
Yep!! :)
anonymous
  • anonymous
Thank you so very much. I have finished the practice test. I have to submit it to the teacher. After this I will take the unit test Monday.
anonymous
  • anonymous
Good luck! :)
anonymous
  • anonymous
OH, well I have a new problem not sure how to do it is |dw:1446366800377:dw|
anonymous
  • anonymous
After submitting to the dropbox of the practice test, the unit test is not that bad until the very last problem.
anonymous
  • anonymous
The options are x = -12/y, x = -12y, x = -3/4y and x = -4y / 3 I am going with x = -12/y
anonymous
  • anonymous
Ok, I got that one wrong. Which should the correct answer have been?
UnkleRhaukus
  • UnkleRhaukus
3x / 4 = -y multiply both sides by 4 3x = -4y divide both sides by 3 x = . . .

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