PLEASE HELP ? PLEASE HELP ?

Speed of pulley A=600 r. p.m.

Speed of pulleys B and C = A : 300 B:1200 C:600

Speed of pulley D = A:6 B:60 C:600

Ateacher brought a pack of 17 batteries . each calculator uses 3 batteries . how many calculator can the teacher fill with batteries

What is the slope of the line passing through the points (-5, 7) and (-3,5)?

Were only 64 seats. the remaining 6 students had to travel in a separate van. the equation 2b + 6 = 70 represents the given scenario. what does b represent? the number of buses the number of vans the number of students who rode on each bus the total number of students going to the football game