Answer:
Step-by-step explanation:
Let the number of days is x.
Joseph tweets 13 times a day.
<u>The number of tweets after x days would be:</u>
t(x) - number of tweets after x days.
is<u> Rational</u> because<u> it's a non-perfect square</u>
x = 5
Given
13 = - 7 + 9x - 5x , that is
13 = - 7 + 4x ( add 7 to both sides )
20 = 4x ( divide both sides by 4 )
5 = x