Mathhh pl

1) which of the following function are one-to-one ? select all that apply.

a)f(x)=x-1/3x+3

b)f(x)=√5x+9

c)f(x)=7/4x^2

d)f(x)=1/2x^3

d)f(x)=3x^4+7x^3

2) find f^-1 for the function f(x)=∛x-2+8

a) f^-1(x)=(x-8)^3+2

b)f^-1(x)=(x+8)^3+2

c)f^-1(x)=∛x-8+2

d)f^-1(x)=(x-8)^3-2

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.