Solve the problem.Find equations for the horizontal and vertical tangent lines to the curve 
A. Horizontal: y = 0 at (0, 0), y = at 
; vertical: x = 
at 
, x = - 
at 
B. Horizontal: y = 
at 
, 
at 
; vertical: 
C. Horizontal: y = 7 at (7, 0), y = 0 at 
; vertical: x = 
at 
, x = - 
at 
D. Horizontal: y = 
at 
, y = - 
at 
; vertical: x = 0 at (0, 0), x = 7 at 
Answer: B
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Describe the graph of the polar equation. r = 50 sin ?
A. Ellipse centered at the origin with intercepts (±1, 0) and (0, ±25) B. Horizontal line passing through (0, 50) C. Circle with radius 25 and center (0, 25) D. Parabola opening upward with vertex at (0, 25)
Identify the form of the argument and state whether the argument is valid or invalid.If it's Tuesday, then this must be Paris.Today is Wednesday. Therefore, this must not be Paris.
A. Law of syllogism; valid B. Fallacy of the inverse; invalid C. Fallacy of the converse; invalid D. Law of contraposition; valid
Find all solutions of the equation in the interval [0°, 360°). Round the answers to the nearest tenth of a degree.sec ? = -9.7
A. {84.1°, 264.1°} B. {95.9°, 264.1°} C. {84.1°} D. {264.1°, 275.9°}
Use a calculator to estimate the limit.
x4ex
A. ? B. 0 C. 4 D. 1