1. a) Complete the function so that

f: R → R, f (x) = x + 3, be strict

decreasing.

b) Graph the function f.

c) Find the zero of the function f.

d) Determine the sign of the function f.

e) Specify the slope of the graph of the function f.

2. Find the value of the function f: R + → R +

f (x) = x, for the value of the argument

of 961.

3. a) Write the formula that expresses the dependency

the length of the circle of its radius.

b) Is this dependence a proportion

direct quality? Argue the answer.

4. A string (xn) is defined by the formula

rank term n:

xn = n ^ 2-7n + 6

a) Write the first five terms of the string.

b) Determine the rank of the term equal to

24 of this string.