The letters x and y represent rectangular coordinates. Write the equation using polar coordinates (r, ?).xy = 1
A. 2r2 sin ? cos ? = 1
B. 2r sin ? cos ? = 1
C. r sin 2? = 2
D. r2 sin 2? = 2
Answer: D
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Write the equation of the line with the given slope and y-intercept.slope 
;y-intercept (0, -14)
A. y = 
x - 14
B. y = - 
x - 14
C. y = 
x + 14
D. y = - 
x + 14
Solve the formula for the specified variable.P = 2L + 2W for L
A. L = 
B. L = P - W
C. L = 
D. L = d - 2W
Solve the problem.A figure skater must trace a figure eight on the ice that consists of two perfect circles, each with a radius of 9 ft. How far does the skater go in tracing the figure eight?(Use 3.14 for ? .)
A. 28.26 ft B. 113.04 ft C. 26.26 ft D. 56.52 ft
Provide an appropriate response.Use the FOIL method to show that (8x + 16)(x - 9) is 8x2 - 56x - 144. If you were asked to completely factor 8x2 - 56x - 144, why would it be incorrect to give (8x + 16)(x - 9) as your answer?
What will be an ideal response?