Two communications companies offer calling plans. With Company X, it costs 30¢ to connect and then 4¢ for each minute. With Company Y, it costs 20¢ to connect and then 3¢ for each minute. Write
and simplify an expression that represents how much more Company X charges, in cents, for n
minutes.

21

step-by-step explanation:

no

step-by-step explanation:

the diagram shows you   triangle def with de=4, df=9 and de≠df≠ef.

the sum of the lengths of two triangles' sides are always greater than the length of the third side:

substitute sides lengths:

then 5< ef< 13 (option 3 is true).

def is a scalene triangle with all sides of different lengths (option 5 is true, option 2 is false).

answer: correct choices are 1, 3 and 5