Posted by **anonymous** on Friday, March 18, 2011 at 12:02pm.

1) For which of the following functions is f(-5) = 2 ? a)f(x) = x +7 b) f(x) = 2x-6 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 ?

- Algebra -
**MathMate**, Sunday, March 20, 2011 at 10:35am
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).

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