Mr burns class is taking a field trip to the planetarium. the trip will cost $27 for each student. there are 18 students in his class. use compatible numbers to estimate the total cost of the field trip.

no, x cannot be the same number. in all of them, x is 1. for one input there is another output. g is not a function

give brainliest

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.