Rectangle PQRS lies in the xy-coordinate plane so that its sides are not parallel to the axes. What is the product of the slopes of all four Sides of rectangle PQRS?
A. -2
B. -1
C. 0
D. 1
E. 2
A colored marble is to be chosen at random from a bag of marbles. The probability that the
A. 36
B. 64
C. 72
D. 81
E. 108
To cut the food budget, people begin to
A. eat less regardless of health.
B. try to lose weight.
C. choose cheaper food.
D. work an extra ten hours.
【C5】
A. though
B. if
C. as
D. unless