You randomly choose one of the pens shown. What is the theoretical probability of choosing a black pen? A drawing shows 2 blue pens, 2 black pens, and 1 red pen.

The theoretical probability is
PLS HURRY!

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

Write the equation in general quadratic form: plz !

If we pull out the middle player of team a and the fourth player of the team b. what will be the force of team a and team b? what is their sum of forces