Ireally need 1. there are 3 black marbles and 4 red marbles in a bag, what is the probability that you will pick a black marble out of the bag? show your work 2. there are 3 black marbles and 4 red marbles in a bag, what is the probability that you will pick two black marbles out of the bag, without replacing the first one chosen? show your work 3. there are 3 black marbles and 4 red marbles in a bag, what is the probability of picking a black marble, replacing it back in the bag, and then choosing another black marble, show your work

With #! i’ve tried to figure it out but i can’t.

Alonso walked with his friend andy one day, and wanted to compare their speeds. alonso walked 3 miles in one hour, and andy walked 2 miles in 2 hours. complete the table to graph the relationship for each person.

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?