3 4/7 minus 2 1/5 by rounding to the nearest half

Given this information, which expression must represent the value of b?

Jessica and martha each have a bag of cookies with unequal quantities. they have 30 cookies total between the two of them. each of them ate 6 cookies from their bag. the product of the number of cookies left in each bag is not more than 80. how many more cookies will jessica have martha? if x represents the number of cookies jessica started with, complete the statements below.the inequality that describes the relationship between the number of cookies each one of them has is x^2 - x +224 > = 0.jessica has at least cookies more than martha.

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year