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Algbrea 2 Math

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2 Answers

Phrase "Write a proportion that models the situation." means triangles are similar and corresponding sides are proportional. 

 12       x
---- = -----  
 4        10

after cross-multiplication we have: 

4x = 12 * 10

x = 120 / 4

x = 30 (units)

==========
For this particular case, could be good practice, first, to simplify the fraction on the left side of proportion:

 3       x
--- = ----
 1      10 

1*x = 3*10 

x = 30 
Hi again Bridget;
I APOLOGIZE FOR THE TYPOGRAPHICAL ERROR.  THANK YOU NATALIYA.
4, 7, 10
12, y, x
 
Let's observe the first column of numbers in that...
4 x 3 =12
Henceforth...
10(3)=x
30=x
 
Also...
7(3)=y
21=y