Ben dives from a 36-foot platform. the equation h=16t^2+14t+36 models the dive. how long will it take ben to reach the bottom?

Does the problem involve permutations or? combinations? do not solve. the matching section of an exam has 4 questions and 7 possible answers. in how many different ways can a student answer the 4 ? questions, if none of the answer choices can be? repeated?

The center of a circle represent by the equation (x+9)^2+(y-6)^2=10^2 (-9,6), (-6,9), (6,-9) ,(9,-6)

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes