That would be D
the first 3 = -12x + 24
bur D = -12x - 24
You are dividing to find the answer
Every two triangles are similar. Therefore the sides of triangles are in proportion.
We have the equations:
1.
<em>cross multiply</em>
<em>divide both sides by 5</em>
<em>subtract 3 from both sides</em>
--------------------------------------
2.
<em>cross multiply</em>
<em>divide both sides by 3</em>
------------------------------------------
3.
<em>cross multiply</em>
<em>divide both sides by 5</em>
<em>subtract 12 from both sides</em>
----------------------------------------------
4.
<em>cross multiply</em>
<em>divide both sides by 3</em>
well 60/5=12
so you get $12 per yard
12*15=180
or you could notice that 5 goes into 15 3 times and then multiply 60*3 any way the answer is 180
