Mrs. hall has seen 15 girls and 10 boys walk by her classroom between will periods. what is the probability that the next person she sees walk by be a boy?

Which of these sequences is a geometric sequence a 1,2,4, 7, 11, 16, 22. b. 2.4.8.14.22.38 c.3.6.9. 15.18,21 d. 3,9,27,81,243,729,

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.