Question

Emanuel has 745 pictures in his phone. His memory is getting full, so he starts deleting 20 pictures everyday. Define each variable and write an algebric expression to describe the number of pictures left on his phone after any given number of days.

Answer 1

An algebraic expression would be:
720-20x
x=the number of days

Testing out the expression:
Ex: 9 days of deleting photos
720-20(9)
720-180
=540 photos left

Hope this helps!
-Benjamin