a number decreased by the sum of the number and four
and show the steps

let the number be x.

a number decreased means

x-

and the sum of the number and 4 is

x+4

to put the expression together, we get. put them in parentheses

x - ( x+4 )

= x - x -4

= - 4

70 years.

step-by-step explanation:

false

step-by-step explanation:

the reason i say this is because for a certain length of sides you can pick any two and the length is wither equal or greater than the third side and in this case it's not.

3 + 5 = 8

8 is smaller than 9 which is the third side.

hope this : )