Use the properties of real numbers to simplify the expression.
(-0.38) 
A. 1
B. 
C. -0.38
D. -1
Answer: C
Mathematics
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The letters x and y represent rectangular coordinates. Write the equation using polar coordinates (r, ?).y = 5
A. r cos ? = 5 B. r = 5 C. r sin ? = 5 D. sin ? cos ? = 5
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Write the expression in standard form.9i + (-3 - i)
A. -3 + 8i B. 3 - 8i C. -3 + 10i D. 3 - 10i
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Use the even-odd properties to find the exact value of the expression. Do not use a calculator.csc 
A. 1 B. -1 C. 0 D. undefined
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Solve the problem.An arrow is fired into the air with an initial velocity of 160 feet per second. The height in feet of the arrow t seconds after it was shot into the air is given by the function 
Find the maximum height of the arrow.
A. 80 ft B. 720 ft C. 1200 ft D. 400 ft
Mathematics