1.- Decide which of the following sentences is false

a) A Cartesian coordinate system specifies each point uniquely

b) A Cartesian coordinate system uses a pair of numerical coordinates

c) The coordinate axes are a pair of fixed perpendicular lines

d) The horizontal axis is called ordinate axis

2.- Which of the following relations is not a function

a) y^{2} = x

b) The relation that associates each Natural Number with 1

c) y = x^{2}

d) None of them

3.- Decide which is the graph of the function: y = 2x + 1

a)

b)

c)

4.- The intersection points with axis of the function y = 2x + 1, are:

a) (1/2,0) and (0,1)

b) (1,0) and (0,1/2)

c) (1,0) and (0,-1/2)

d) (-1/2,0) and (0,1)

5.- The intersection points with axis of the function y = x^{2} + 1, are:

a) (0,1),(-1,0) and (1,0)

b) (0,1)

c) (0,1) and (1,0)

d) (0,1),(0,-1) and (1,0)

6.- Decide which of the following sentences is true

a) There aren't functions which are discontinuous in R

b) All the functions are continuous

c) There aren't functions whcih are discontinuous in infinite points

d) All of them are false

7.- is continuous in

a) R-{3,6,9}

b) R-{3,9}

c) R-{3,6}

d) R-{6,9}

8.- It is increasing in:

a) (0,3)U(3,4.5)U(9,∞)

b) (0,3)U(3,4.5)U(6,7)U(9,∞)

c) (0,3)U(3,4.5)U(6,7.5)U(9,∞)

9.- It has a minimum in:

a) absolute minimum in 0 and relative one in 6

b) absolute and relative minimum in 0 and relative one in 6

c) absolute and relative minimum in 0

10.- It has a maximum in:

a) Absolute and relative maxima in 4.5 and 7.5

b) Relative maxima in 4.5 and 7.5

c) Absolute maximum in 7.5 and relative one in 4.5

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