For how many integral values of n are the numbers 2n, 3n and 10 - n the lengths of the sides of an obtuse triangle? ∵ a correct answer + a good explanation will guarantee you a :)
(This is from AMC 10 so if you answer it, Congrats! Ur rlly smart and everyone knows it :)

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.

Define multiplicative inverse. give an example of a number and its multiplicative inverse.

Solve 2 - 3 cos x = 5 + 3 cos x for 0° ≤ x ≤ 180° a. 150° b. 30° c. 60° d. 120°