At a summer camp there are 10 teenagers sleeping in each tent. assume that these 10 teenagers are independent of each other. what is the probability that at least one of them suffers from arachnophobia?

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?

Susie wants to take her friend out for lunch.she wants to spend $9.75 each person. how much will she spend in all.