Ms-Brains
  • Ms-Brains
Can somebody help check 12 of my practice questions? I need to make sure they are correct to prepare for class. I will fan and medal
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Ms-Brains
  • Ms-Brains
#8 I don't know how to solve these kind of problems, So my best guess is A.
Vocaloid
  • Vocaloid
well, first we pick an arbitrary number x then, we know that the ratio of 5x to 3x is 5 to 3, with me so far?
Ms-Brains
  • Ms-Brains
Yeah

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Vocaloid
  • Vocaloid
good, and the sum is 16 so 5x + 3x = 16 solve for x
Ms-Brains
  • Ms-Brains
x=2?
Vocaloid
  • Vocaloid
good. now we work backwards and find 5x and 3x
Ms-Brains
  • Ms-Brains
You lost me there, how do we work backwards?
Vocaloid
  • Vocaloid
well we just found out that x = 2 so what are 5x and 3x equal to?
Ms-Brains
  • Ms-Brains
10 and 6?
Vocaloid
  • Vocaloid
yup so 10 and 6 are our answers
Ms-Brains
  • Ms-Brains
Awesome, thanks so much! You are really helping me learn a bunch
Vocaloid
  • Vocaloid
uh you just posted the same question
Ms-Brains
  • Ms-Brains
Oh! sorry give me second xD
benlindquist
  • benlindquist
lol
Ms-Brains
  • Ms-Brains
#9. A?
benlindquist
  • benlindquist
Looks right, ?
Vocaloid
  • Vocaloid
hm not quite
benlindquist
  • benlindquist
do you add? divide?
Vocaloid
  • Vocaloid
find: 100*(new height-old height)/(old height)
Ms-Brains
  • Ms-Brains
100*120/15 = 800
Vocaloid
  • Vocaloid
nope
Vocaloid
  • Vocaloid
new height - old height = ?
Ms-Brains
  • Ms-Brains
Wait, so its not 100*120/15? It is 100*120-15?
Vocaloid
  • Vocaloid
neither
Vocaloid
  • Vocaloid
100*(new height-old height)/(old height) = 100*(120-15)/15 = ?
Ms-Brains
  • Ms-Brains
100*(120-15)/15 = 700%
Vocaloid
  • Vocaloid
yes! [if you're wondering why we subtract new height - old height, it's asking for the INCREASE, so we need to know how much the height increased by first]
Vocaloid
  • Vocaloid
[this concept actually confuses a lot of people. "percent increase" is different than "percent of"]
Ms-Brains
  • Ms-Brains
B?
Vocaloid
  • Vocaloid
not quite well, remember how we went from 3.1 to 310% by multiplying by 100? in this situation we're doing the opposite, so we divide by 100
Ms-Brains
  • Ms-Brains
So A then? 0.0001
Vocaloid
  • Vocaloid
yup
Ms-Brains
  • Ms-Brains
C?
Vocaloid
  • Vocaloid
nope (remember that "percent" means per 100, not 200 just divide 20/200
Ms-Brains
  • Ms-Brains
So it;s 20%?
Vocaloid
  • Vocaloid
no, it's not 20%
Vocaloid
  • Vocaloid
what is 20 divided by 200?
Ms-Brains
  • Ms-Brains
10%
Vocaloid
  • Vocaloid
good
Ms-Brains
  • Ms-Brains
Last one. My best guess on this is A. I Don't know how to solve it. ;-;
Vocaloid
  • Vocaloid
simple interest means he earns 4% of 5500 each year so, first find 4% of 5500
Ms-Brains
  • Ms-Brains
220%
Vocaloid
  • Vocaloid
just 220, no percent sign now multiply that by 5
Ms-Brains
  • Ms-Brains
1100
Ms-Brains
  • Ms-Brains
So it was A xD
Ms-Brains
  • Ms-Brains
Right? o.O
Vocaloid
  • Vocaloid
yeah I didn't really look at the answer choices beforehand :P
Ms-Brains
  • Ms-Brains
Thanks so much for the help. :)
Ms-Brains
  • Ms-Brains
We're all done. :)

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