Among the eighth-graders in michael’s school, 70% have siblings. the eighth-grade class is the size of the seventh-grade class.
if 112 eighth-graders have siblings, how many students are in the seventh grade?

a. 128

b. 134

c. 160

d. 920

i need quick

The late fee for library books is $2.00 plus 15¢ each day for a book that is late. if maria’s fee for a late book was $3.20, write and solve a linear equation to find how many days late the book was.

Walgreens sells both kleenex and nyquil. in a random sample of 5000 purchases, it was found that 1200 contained kleenex and 540 contained nyquil. these are not independent because sick people are more likely to buy both and healthy people more likely to buy neither. in looking into that, it was found that 360 purchases contained both. a. make a two-way table to display this information. fill in the table with the missing entries, and be sure your table has row and column totals. b. if we randomly select a purchase that contained kleenex, what is the probability it also contained nyquil? c. what percent of all purchases didn’t contain either product?

Find two numbers if their ratio is 4: 7 and their difference is 123.