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)

- anonymous

- schrodinger

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- anonymous

@jim_thompson5910 i stuck

- anonymous

Hint: You can cross multiply here.

- jim_thompson5910

when you cross multiply 2/3=3/y what do you get?

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## More answers

- anonymous

no solution

- jim_thompson5910

a/b = c/d
cross multiplies to
a*d = b*c

- anonymous

y =9/2

- jim_thompson5910

dont' completely solve for y though

- jim_thompson5910

just do this first step of cross multiplication

- anonymous

2y=9

- jim_thompson5910

better, but that 9 can be written as what

- anonymous

9x

- jim_thompson5910

9 = 9*1
9 = something * something
what goes in the place of "something" ?

- anonymous

2y= (3)(3)

- jim_thompson5910

you got it

- anonymous

Which of the following is equivalent to the proportion
3/4=x/12

- jim_thompson5910

I'm assuming there are choices
post them please and tell me which one you got

- anonymous

A. 4/3= 12/x
B. 3/4= 12/x
C. 4/3= x/12
D. 4/12= x/3

- jim_thompson5910

which one did you get

- jim_thompson5910

hint:
if
a/b = c/d
then you can flip both sides to get the equivalent equation
b/a = d/c

- anonymous

A right?

- jim_thompson5910

good, you got it

- 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

B is incorrect

- jim_thompson5910

a/b = c/d
cross multiplies to
a*d = b*c

- anonymous

1/3=y/26
26=3y

- 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

so our answer would be D then

- jim_thompson5910

correct

- 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

I think its B

- jim_thompson5910

solve for x
6/20 = 4/x

- anonymous

x=40/3

- anonymous

?

- jim_thompson5910

which is x = 13.333 in decimal form
round this to the nearest whole number to get x = 13

- anonymous

so our answer is 13

- jim_thompson5910

you got it

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