It's called a plus sign. It tells you to add the value before the sign to the value after the sign. The two values in an addition problem are called "addends" and the answer is called the "sum." You will also see two different layouts of addition problems.
Answer:
each sister would get 14 pencil
ya there will be 2 pencils left over
Answer:
perpendicular to each other
Step-by-step explanation: