A person is standing 350 feet away from a model rocket that is fired straight up into the air at a rate of 15 fusec. At what rate is the distance between the person and the rocket increasing 20 seconds after liftoff?

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

Ammonia molecules have three hydrogen atoms and one nitrogen atom.how many of each atom arein five molecules of ammonia

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of