PLEASE HELP Speed of pulley A = 400 r. p.m.

Speed of pulley B =

A:100
B:200
C:1600

Speed of pulley C =
A:100
B:1600
C:200

Speed of pulley D =
A:100
B:40
C:160

If, while training for a marathon, you ran 60 miles in 2/3 months, how many miles did you run each month? (assume you ran the same amount each month) write your answer as a whole number, proper fraction, or mixed number in simplest form. you ran __ miles each month.

Combine like terms to make a simpler expression 3z+z

Ibeg you to me 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?