Which equation represents a hyperbola? 4x2 + 3x + 4y2+ 5 = 0 2x2 – 5xy + 4y2 + 10x – y + 12 = 0 3x2 - 6xy + 3y2 + 5x – 2y + 1 = 0 3x2 + xy - 9y2 + 2x + 5 = 0​

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