Lunch cost $4.14 and she got $5.86
Answer:
Step-by-step explanation:

? = 2x -x = x
If we assume the student’s sample is representative of the whole population, then yes, the student can be considered accurate.
7 / 50 = 0.14
400 * 0.14 = 56
About 56 of the 400 students can be estimated to have traveled outside the US.