Answer:
Tally marks
Step-by-step explanation:
It is most likely tally marks because all of the other options are more recent than option b the Greek and Latin letters are dated to be closer to the modern times than the cavemen were.
Answer:
4.8 minutes
Step-by-step explanation:
2.5/2.5=1
so
12/2.5=4.8
True because the two legs form a 90 degree angle
Answer:
Step-by-step explanation:
We need to square a binomial.
The following rule is applied:
In our example,
A is equal to 5x,
B is equal to -19 and
N is equal to 2.