anonymous
  • anonymous
Which of the following is equivalent to the proportion 2/3=3/y? A. 3y = (2)(3) B. 2y = (2)(3) C. 2y = (3)(3) D. 3y = (3)(3)
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
anonymous
  • anonymous
Hint: You can cross multiply here.
jim_thompson5910
  • jim_thompson5910
when you cross multiply 2/3=3/y what do you get?

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anonymous
  • anonymous
no solution
jim_thompson5910
  • jim_thompson5910
a/b = c/d cross multiplies to a*d = b*c
anonymous
  • anonymous
y =9/2
jim_thompson5910
  • jim_thompson5910
dont' completely solve for y though
jim_thompson5910
  • jim_thompson5910
just do this first step of cross multiplication
anonymous
  • anonymous
2y=9
jim_thompson5910
  • jim_thompson5910
better, but that 9 can be written as what
anonymous
  • anonymous
9x
jim_thompson5910
  • jim_thompson5910
9 = 9*1 9 = something * something what goes in the place of "something" ?
anonymous
  • anonymous
2y= (3)(3)
jim_thompson5910
  • jim_thompson5910
you got it
anonymous
  • anonymous
Which of the following is equivalent to the proportion 3/4=x/12
jim_thompson5910
  • jim_thompson5910
I'm assuming there are choices post them please and tell me which one you got
anonymous
  • anonymous
A. 4/3= 12/x B. 3/4= 12/x C. 4/3= x/12 D. 4/12= x/3
jim_thompson5910
  • jim_thompson5910
which one did you get
jim_thompson5910
  • jim_thompson5910
hint: if a/b = c/d then you can flip both sides to get the equivalent equation b/a = d/c
anonymous
  • anonymous
A right?
jim_thompson5910
  • jim_thompson5910
good, you got it
anonymous
  • anonymous
What is the first step that you have to do in order to solve the proportion: 1/3=y/26 A. 8.5 B. 26y = 3 C. y = 3(26) D. 3(y) = 1(26) I got B!:)
jim_thompson5910
  • jim_thompson5910
B is incorrect
jim_thompson5910
  • jim_thompson5910
a/b = c/d cross multiplies to a*d = b*c
anonymous
  • anonymous
1/3=y/26 26=3y
jim_thompson5910
  • jim_thompson5910
good, you got it, so that's close to 3(y) = 1(26) you just have to factor and flip the equation
anonymous
  • anonymous
so our answer would be D then
jim_thompson5910
  • jim_thompson5910
correct
anonymous
  • anonymous
When movies are being created, the set designers often use miniature models before they create the actual movie set. The set designers for Jurassic Park 3, created a 6 inch high and 4 inch long model dinosaur that represented a 20 feet high dinosaur on the set. How long was the actual dinosaur, rounded to the nearest foot? A. 15 feet B. 13 feet C. 14 feet D. 12 feet
anonymous
  • anonymous
I think its B
jim_thompson5910
  • jim_thompson5910
solve for x 6/20 = 4/x
anonymous
  • anonymous
x=40/3
anonymous
  • anonymous
?
jim_thompson5910
  • jim_thompson5910
which is x = 13.333 in decimal form round this to the nearest whole number to get x = 13
anonymous
  • anonymous
so our answer is 13
jim_thompson5910
  • jim_thompson5910
you got it

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