Which of the following could be an example of a function with a domain (-∞,∞) and a range (2,∞) ? Check all that apply.
a. y = 3^x + 2
b. y = - (3)^x - 2
c. y = 0.25^x + 2
d. y= - (0.25)^x - 2

Question

Which of the following could be an example of a function with a domain (-∞,∞) and a range (2,∞) ? Check all that apply.
a. y = 3^x + 2
b. y = - (3)^x - 2
c. y = 0.25^x + 2
d. y= - (0.25)^x - 2

anonymous · Answer

a and c

anonymous · Answer

how are you so smart?

kainui · Answer

He's actually not, how do you know he's actually not wrong? He would have explained it if he actually knew what he was talking about.

anonymous · Answer

can you help me then?

anonymous · Answer

just graph 'em

anonymous · Answer

Once I graph them I don't know how to read it to see what is infinity...

kainui · Answer

That seems legitimate, I don't think anyone knows what happens at infinity since most of the time infinity is just another way of saying "increasing without bound". I don't think anyone's ever been there.

So is this a calculus or algebra sort of class first of all, because I will give you different advice depending on which.

anonymous · Answer

It's PreCalc/trig

anonymous · Answer

if it's not a and c then is it b and d?

anonymous · Answer

I'm going to put b and d. I hope they are right...