5. D. <span>2.25k≥180;k≥80
6. A. </span>
What we want to draw is the half closed interval:
I= [-5, 4) excluding 0,
as the union of 2 different intervals say a and b.
Let a be the interval containing the smallest value.
Then the smallest value of a is -5, and the largest possible value of a is 0, not included, if we want to write a as an interval, without "gaps", or "holes".
So a=[-5, 0)
similarly, b=(0, 4).
Answer: [-5, 4)=[-5, 0)∪(0, 4)
Answer:
B, D
Step-by-step explanation:
Solve all equations:
A.

This is false equality, so this equation has no solutions.
B.

This equality is true for all values of x, so this equation has infinitely many solutions.
C.

This equation has the unique solution.
D.

This equality is true for all values of x, so this equation has infinitely many solutions.
E.

This equation has the unique solution.
Answer:
No
Step-by-step explanation:
There isn't a slope so I'm guessing it's not a function