A bag contains 30 white marbles and 40 black marbles. if 5 marbles are chosen, what is the probability that there will he 2 white marbles and 3 black marbles

Need to increase the numbers of customers i talk to daily by 20% how many customers do i need to talk to if i talk to a average of 8 customers per hour during an 8 hour shift

This is about circle theorems. someone asap : (

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi