Answer:
The greatest possible value of xy is 165.
Step-by-step explanation:
Step-by-step explanation:



Answer:
no
Step-by-step explanation:
Solution:x^2+3x-4=(x+4)(x-1)>0,
therefore, the x range is (-∞,-4)∪(1,+∞).
Answer:(-∞,-4)∪(1,+∞).[
Answer:
True
Step-by-step explanation:
Three points define a plane.
If two or more of the points are coincident, the points define an infinite number of planes. In any event, there is at least one plane that will contain all three points.