The letters r and ? represent polar coordinates. Write the equation using rectangular coordinates (x, y).r = cos ?
A. (x + y)2 = y
B. x2 + y2 = y
C. x2 + y2 = x
D. (x + y)2 = x
Answer: C
Mathematics
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Use the requested method to find the product.137 ? 88; Use the Russian peasant method
A. 12,046 B. 12,156 C. 12,056 D. 12,066
Mathematics
Identify the form of the argument and state whether the argument is valid or invalid.If it is cold, then you need a coat.You do not need a coat. Therefore, it is not cold.
A. Fallacy of the inverse; invalid B. Law of syllogism; valid C. Law of contraposition; valid D. Fallacy of the converse; invalid
Mathematics
Solve by using the quadratic formula.8x2 + 7x = -2
A. 
B. 
C. 
D. 
Mathematics
Evaluate.
for a = -9 and b = 5
A. 
B. 1
C. - 
D. -1
Mathematics