I would really appreciate if someone could help me with this and explain:)

Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income

What is the solution of the systems of equations? y=2/3x+3 x=-2

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.