4. 40% of the marbles in a bag are yellow. the rest are orange and green. the ratio of the number of orange to the number of green is 4: 5. if there are 30 green marbles, how many yellow marbles are there? use a visual model to show your answer.

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

What is the equation of the parabola with focus (-1,-1) and directrix y=1?

An engineer is going to redesign an ejection seat for an airplane. the seat was designed for pilots weighing between 120 lb and 161 lb. the new population of pilots has normally distributed weights with a mean of 125 lb and a standard deviation of 28.1 lb. a)if a pilot is randomly selected, find the probability that his weight is between 120 lb and 161 lb.the probability is approximately? b. if 36 different pilots are randomly selected, find the probability that their mean weight is between 120 lb and 161 lb. the probability is approximately? c. when redesigning the ejection seat, which probability is more relevant? . part (b) because the seat performance for a single pilot is more important. b. part (b) because the seat performance for a sample of pilots is more important. c. part (a) because the seat performance for a sample of pilots is more important. d. part (a) because the seat performance for a single pilot is more important.