Need help with a few problems

Question

anonymous · Answer

$$f(x)=\sqrt{2x-5}$$
find f(7)


	A.	2
	B.	3
	C.	-5
	D.	7

anonymous · Answer

What is the range of the inverse of the relation {(1, 7), (2, -4), (5, 6), (2, 8)}?
	A.	{1, 2, 5}
	B.	{-4, 6, 7, 8}
	C.	{1, 5}
	D.	{-4, 7, 8}


What is the range of {(-4, 0), (-2, 1), (1, 3), (2, 6)}?
	A.	{-4, -2, 1, 2}
	B.	{-4, -2, 1}
	C.	{0, 1, 3, 6}
	D.	{0, 1, 3}

anonymous · Answer

$$f(\heartsuit)=\sqrt{2\heartsuit -5}$$
$$f(7)=\sqrt{2\times 7-5}$$

anonymous · Answer

What is the range of the inverse of the relation {(1, 7), (2, -4), (5, 6), (2, 8)}
that is the domain of that relation, list the first numbers in each ordered pair

anonymous · Answer

What is the range of {(-4, 0), (-2, 1), (1, 3), (2, 6)}
list the second numbers of each ordered pair

anonymous · Answer

Dear @ vexus ,  Ask one question at a time. And if  you have many questions, post them separately.

anonymous · Answer

I got 2 for f(7)
B
C

anonymous · Answer

A*