A= 13+26+39++169
what is the sum of the prime numbers that can divide a ?
a)16 b)18 c)20 d)22 e)24

A= 13+26+39+...+169=

= 13(1+2+3++13)=

=13* (13*14)/2=

=13*13*7

=> 13+7=20

So the answer is c)

x/3-10=8

x/3=18

x=48

the formula of a slope:

from a table we have

substitute:

the slope of f(x) is -1.

the graph of funcfion g(x) is a horizontal line. the slope of a horizontal line is equal 0. therefore the slope of g(x) is 0.

-1 < 0