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 = x
C. x2 + y2 = y
D. (x + y)2 = x
Answer: B
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Solve.A card is drawn from a well-shuffled deck of 52 cards. What is the probability of getting a red 3?
A. 
B. 
C. 
D. 
Solve using matrices.6x + 8y = 89x - 3z = -136y - 3z = 11
A. 
B. 
C. 
D. 
Provide an appropriate response.Solving for which variable in which equation involves the least amount of work? 3x = 6x - 9y = 29
A. x in equation 1 B. x in equation 2 C. y in equation 2 D. y in equation 1
Provide an appropriate response.A student is trying to solve the equation (x + 9)(x - 6) = 6. The student has set x + 9 = 6 and x - 6 = 6 and found that two solutions x = -3, x = 12. The student checks his or her results by plugging in his or her solutions into the original equation and finds that they do not work. How would you advise him or her?
What will be an ideal response?