The Geology Club is on a trip to study the Grand Canyon during spring break. While waiting in the airport security line, Courtney notices that it takes about 4 minutes for 15 people to pass through security. Courtney estimated that there are about 100 people ahead of her school ground in line. She is growing impatient and decide to figure out how long it takes.

Which of the following answers is 7/9 simplified? 7/9 2/9 11/9 2/7

Tod does not have any cookies. david gives jeff 8 cookies. then he splits half of the cookies he has left with tod. david let’s c represent the number of cookies that he starts with. he finds the number of cookies that tod has is 1/2 the difference of c and 8. write an expression to represent the number of cookies that tod has.

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis. 3- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in part b?