Simplify the radical expression 3√(5) + 6√(45)

a) 9√(50
b) 21√(10)
c) 6√(96)
d) 21√(5)

Don't know how to find x given these segment lengths

Asales representative from a local radio station is trying to convince the owner of a small fitness club to advertise on her station. the representative says that if the owner begins advertising on the station today, the club's total number of members will grow exponentially each month. she uses the given expression to model the number of club members, in hundreds, after advertising for t months.

Events a and b are independent. the probability of a occurring is 2/5. the probability of b occurring is 1/4. what is p(a and b)?