The cost of dollars, y, of x books at a book sale is represented by the equation y=4x. Which statement is not true?
A. the total cost is directly proportional to the number of the books purchased
B. The constant of proportionality represents the cost of one book.
C. The cost of 4 books is $16
D. The number of books purchased is 4 times the total cost

The jurassic zoo charges $14 for each adult admission and $5 for each child. the total bill for 77 people from a school trip was $565. how many adults and how many children went to the zoo? i

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?

Michelle and julie work at a catering company. they need to bake 264 cookies for a birthday party that starts in a little over an hour and a half. each tube of cookie dough claims to make 36 cookies, but michelle eats about 1/5 of every tube and julie makes cookies that are 1.5 times as large as the recommended cookie size. it takes about 8 minutes to bake a container of cookies, but since julie's cookies are larger, they take 12 minutes to bake. a. how many tubes should each girl plan to bake? how long does each girl use the oven? b. explain your solution process what did you make? c. what assumptions did you make?