Step-by-step explanation:

therefore, 9 students haven't given their speech
The amount contributed by Willie and Bruno is $31000 and $19,000 respectively.
Let amount contributed by Willie be x
Let amount contributed by Bruno be y
Since Willie agreed to contribute $12,000 more than Bruno;
Therefore;
- x - y = 12000....…....... equation (1)
- x + y = 50,000...…....... equation (2)
By solving the system of equations simultaneously;
In essence; The amount contributed by Willie and Bruno is $31000 and $19,000 respectively.
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Answer:
D) x = 40.5
Step-by-step explanation:
When parallel lines create a smaller triangle inside a larger triangle, the triangles are similar. Triangle similarity means that side lengths are proportional, meaning to find x we must use dimensions of the smaller triangle to create a proportion.
The left side of the larger triangle is 12 + 15, so it is 27.
The left side of the smaller triangle is 12.
So, part of the proportion will be 
The bottom side of the larger triangle is x.
The bottom side of the smaller triangle is 18.
So, part of the proportion will be 
The full proportion will be:

Cross multiply and solve for x.
27(18) = 12x
486 = 12x
40.5 = x
Answer:
10:10,000 is the answer to ur quation