Julie conducts an experiment to find the average word length in a book for a 4th grader and a book for an 8th grader. she finds that for the fourth-grade book the mean word length is 5 letters with a range of 6 and for the 8th-grade book the mean word length is 6 letters with a range of 9. which statement is true?

a and c

for infinitely many solutions we require both left and right sides to be equal

distribute and simplify

a

14 - 8x = 20 - 8x - 6 = 14 - 8x ← both sides equal so infinite solutions

b

6x - 54 = 6x - 54 + x = 7x - 54 ← not equal

c

4x + 16 = 4x + 10 + 6 = 4x + 16 ← both sides equal so infinite solutions

d

5x - 40 + 10 = 5x + 10

5x - 30 = 5x + 10 ← not equal