Do two rays always define a plane ?

A - No, because a ray can’t be used to define a plane
B - Yes, because we need three points
C - No, because two rays might only make one line
D - Yes, because rays can be extended into lines

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

What is the interquartile range of this data set? 2, 5, 9, 11, 18, 30, 42, 48, 55, 73, 81

Solve 4 ln x=2ln25 a) x=5 b) x=25 c) x=625