Answer:
6.4
Step-by-step explanation:
9.8 + 10.9 + x = 27.1
20.7 + x = 27.1
x = 6.4
Over a long period of time. Any given species has to reproduce multiple times and allow time for defects/deformations etc to happen so that the species can diversify itself. It takes years, decades, even centuries to notice genetic changes in species.
There are 3 terms : 7x , 4y, and 1.
a term is separated by any math symbol
examples are =, +, *
Helps you to know how many dots to plot on the dot plot and help you to know if you are missing any dots