The Spache Readability Formula is designed to categorize reading materials for grades 1 through 3. For a passage of text, the variables are S, the number of sentences; W, the number of words; and U, the number of unfamiliar words (words not on a specific list). The formula (as revised) for the grade level is Grade level = 0.121 W S + 0.082U + 0.659 The calculated grade level is rounded down to its whole number part. (For example, 2.6 is rounded down to 2.) In this exercise we consider passages having 230 words and using 12 unfamiliar words. (a) As the number of sentences increases, does grade level increase or decrease? increase decrease Correct: Your answer is correct. (b) What is the maximum possible number of sentences? (Can there be more sentences than words?) 230 Correct: Your answer is correct. sentences (c) What is the minimum number of sentences that would put this passage at the second-grade level