Find a rectangular equation for the curve and describe the curve.x = 4 cos t, y = 4 sin t; -? ? t ? ?
A. x2 + y2 = 4; circle with radius 4
B. x2 + y2 = 16; portion of a circle with radius 4
C. x2 + y2 = 16; circle with radius 4
D. x2 + y2 = 16; ellipse
Answer: C
Mathematics
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A. 
B. 
C. 
D. 
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Evaluate.a + bc, for a = 
, b = 3, and c = 
A. 19
B. 20
C. 20
D. 18
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Insert parentheses, if needed, to make the expression on the left equal to the number on the right.7 ? 3 + 9 ÷ 2 + 2 = 21
A. 7 ? 3 + 9 ÷ (2 + 2) = 21 B. 7 ? 3 + (9 ÷ 2) + 2 = 21 C. 7 ? (3 + 9) ÷ 2 + 2 = 21 D. 7 ? (3 + 9) ÷ (2 + 2) = 21
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