Solve.The land surface of the earth is 57,900,000 square miles. Of this, 19,200,000 square miles are forested. Using scientific notation, express the number of square miles that is not forested.
A. 38.7 × 106 square miles
B. 3.87 × 106 square miles
C. 3.87 × 108 square miles
D. 3.87 × 107 square miles
Answer: D
Mathematics
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Verify the identity.tan 
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Mathematics
Write as an addition problem and find the sum.The temperature was 71 degrees in the morning, but it dropped 16 degrees in the afternoon and another 6 degrees in the evening. What was the temperature in the evening?
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Mathematics
Solve the triangle.a = 6, b = 8, C = 70°
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Mathematics