a grass seed has grown to a 12 millimeter tall blade of grass. Tomorrow it will be 23 millimeters tall, the next day it will be 34 millimeters tall, and on the next day it will be 45 millimeters tall. how tall will the blade of grass be in 15 days

177 mm

Step-by-step explanation:

So first we know that it is 12 mm.Then it shows the first 3 days after the 12 mm part.The last part of the 3 days is 45.So we can do 15-3=12.After we do this,we can do (12 x 11)+45=177.This is is because it is the same thing as 45+11+11+11+11+11+11+11+11+11+11+11+11=177.

The blade of grass will be 165 millimeters tall in 15 days.