Which set of vertices forms a parallelogram? A. A(2,4), B(3,3), C((6,4), D(5,6).
B. A(-1,1), B(2,2), C(5,1), D(4,1)
C. A(-5,-2), B(-3,3), C(3,5), D(1,0)
D. A(-1,2), B(1,3), C(5,3), D(1,1)

At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. the cyclic nature of wind and moving sand determines the shape and location of large dunes. at a test site, the prevailing direction of the wind did not change noticeably. however, the velocity did change. fifty-nine wind speed readings gave an average velocity of x = 1075 cm/sec. based on long-term experience, σ can be assumed to be 245 cm/sec. (a) find a 95% confidence interval for the population mean wind speed at this site. (round your answers to the nearest whole number.) lower limit cm/sec upper limit cm/sec