Sergio drove from tennessee to florida for his spring break. if he drove 495495 miles at 6060 miles per hour, how long did it take him to get to florida?

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16