The student rolled 144 dice and removed all those that landed on the number six. The student rolled the remaining dice and again removed all those that landed on the
number six.
When the student had rolled the dice 20 times there were 9 dice left.
Calculate the most likely number of times that the student had rolled the dice before
the number of dice had halved.
You should show how you work out your answer.

Ajet plane has a sound level of 120 db at a distance of 60 m. what is the q23. sound level at a distance of 6.0 km? (60)2 (6000)? om solution 80db db, hint: 16x assume ultrasound waves travel through the body of an animal at 1540 q24. m/s. if a 30,000 hz signal were reflected off a portion of a heart which was moving toward the source at 3 m/s, what frequency signal would return to the stationary source? solution 30.117hz

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?