Pq and rs are two lines that intersect at point t, as shown below: two lines pq and rs intersect at point t. angles pts and rtq are shown congruent. which fact is used to prove that angle pts is always equal to angle rtq? a. sum of the measures of angles rtq and qts is 180°. b. lines pq and rs intersect at an angle greater than a right angle. c. line segments pq and rs do not have a fixed length. d. sum of the measures of angles ptr and qts is 180°.

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