Answer:
25.5
Step-by-step explanation:
Median is the middle number.
Rearrange the numbers to smallest to biggest.
70, 77, 80, _, 82, 87, 88
If the median of the data set is 81 the middle number needs to be 81.
So the missing number is 81.
70, 77, 80, 81, 82, 87, 88
Answer: 250:1
Step-by-step explanation:
Divide the measurement of appearance by the actual measurement.

The magnification scale is 250:1. The scale is used by a 250X magnifying lense.
Find a common denominator. Typically, the greater the denominator, the smaller the piece.
Answer:
C. The set of rational numbers
Step-by-step explanation:
Don't listen to the other person. I trusted them and got the answer wrong. I just got the question and guessed the second time. I fortunately got the answer right. Good luck! :) <3