Algebra
posted by anonymous on .
1) For which of the following functions is f(5) = 2 ? a)f(x) = x +7 b) f(x) = 2x6 c) f(x) = 3x+5 d) none of these
2) Which of the following is a function? a)(4,1), (1,8), (4,2) b)(4,1), (1,8), (2,2) c)(4,1),(1,8), (1,2) d) none of these
3) what is the relationship between the lines y=8x +5 and y =3x 7 ?
4) evaluate i^14
I think
1 a
2 don't understand
3 don't understand
4  1
can someone veridy & assist me on this ?

1. correct
4. correct
2.
A function is a relation which relates the elements of two sets (of numbers) such that any element of the first set is related to exactly one element of the second set.
For example:
A={1,2,3}, B={4,5,6}
f: A>B is a function which relates elements of set A to elements of set B.
If we define f by (1,4),(2,6),(3,5), then the relation f is a function, since it satisfies the stipulation that any element in A is related to exactly one element in B.
On the other hand,
if we define:
g : A> B such that
(1,4),(1,6),(2,5),
then g is not a function because element 1 of set A is related to two elements of B (4 and 6). So in this case, g is not a function.
3. The two lines are not parallel, so they intersect somewhere in space.
They are not parallel because the slopes are different (8 and 3).