Final answer:
The correct answer to whether Evan or Ryan is right cannot be determined without the context of the specific equation they are discussing. However, cancellation usually refers to multiplication or division, not addition.
Step-by-step explanation:
The question appears to involve Evan and Ryan discussing whether the number 2 can be canceled in addition or if multiplication is needed to cancel the 2s. The provided statements do not specifically address the conversation between Evan and Ryan, but they do provide some pertinent rules on multiplication and division.
For instance, when two positive or two negative numbers multiply, the result is positive. If the numbers have opposite signs, the result is negative. Additionally, dividing by a number is equivalent to multiplying by the reciprocal of that number. It is also critical to understand that only like terms can be canceled or simplified directly in an equation.
Without the specific equation Evan and Ryan are discussing, we cannot determine who is correct. However, using the general rules of mathematics, cancellation typically occurs in situations involving multiplication or division, not in addition or subtraction unless dealing with identical additive inverses.