I'm having a problem with probability. someone asap.

a first grade class of nine girls and seven boys walks into a class in alphabetical order (by last name). what is the probability that three girls are the first to enter the room? show your calculation.

(a) 0.15
(b) 0.20
(c) 0.35
(d) 0.45,

Beatrice decides she wants to babysit a few children at the same time to earn the money faster. she tells parents that if they allow her to babysit their children at her house, she will eliminate her automatic $5 tip and will give them an additional $5 discount. (a) write an equation showing the total cost for each client. identify all variables. (b) four parents bring their children to beatrice’s house at the same time for babysitting. beatrice wants to find out how many hours she must babysit the 4 children to earn exactly the $100 she needs in order to buy the present for her mother. write and solve an equation to find the number of hours. justify each step in the solution. (c) one parent decides not to drop off her child. the remaining 3 parents drop their children off at 9 a.m. two of the parents say they will be back at 1 p.m. the third parent says she will pick up her child at 2 p.m. at noon, beatrice realizes she needs feeding the 3 ch

If 1 is divided by the sum of y& 4.the result is equal to 3 divided by 4, find the value of m

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)