Which of the following also describes a tetrahedron?

a. regular prism
b. regular pyramid
c. regular polygon
d. a cube

Which choice represents the sample space ,s for this event

You are on a cycling trip around europe with friends. you check the weather forecast for the first week. these are the temperatures for the week. sun mon tues wed thurs fri sat 16°c 20°c 24°c 28°c 28°c 23°c 15°c what is the mean temperature forecast for the week?

Could somebody me with this radical simplification?