The roof at a tennis stadium opens 421 inches in 50 seconds. How many inches does the roof open per second?
A.) 0.12
B.) 8.42
C.) 371.0
D.) 471.0
Plz answer this QUIC I need this answer really badly.

Which expression calculates the speed in meters per second of an object that travels a distance of 100 m every 20 seconds

Suppose sat writing scores are normally distributed with a mean of 497 and a standard deviation of 109. a university plans to award scholarships to students whose scores are in the top 2%. what is the minimum score required for the scholarship? round your answer to the nearest whole number, if necessary.

True or false? a circle could be circumscribed about the quadrilateral below.