Answer the question.A tree casts a shadow 40 meters long. At the same time, the shadow cast by a vertical 5 meter stick is 10 meters long. Find the height of the tree.
A. 
B. 50
C. 20
D. 80
Answer: C
Mathematics
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Which of the following technological trends has played a significant role in the global economy?
A. emphasis on saving the environment B. increased health consciousness C. emergence of the Internet D. employment power shift
Mathematics
Solve.-19 ? 
? -11
A. 5 < x < 9 B. 5 < x ? 9 C. 5 ? x < 9 D. 5 ? x ? 9
Mathematics
Establish the identity.csc 4 x - cot 4 x = csc 2 x + cot 2 x
What will be an ideal response?
Mathematics
Find 10111 2 + 1011 2.
What will be an ideal response?
Mathematics