Richard has 5 markers in a backpack. one of them is black and one is red. find the probability richard will reach into the backpack without looking and grab the black marker and then reach in a second time and grab the red marker. express your answer as a fraction in simplest form.

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.

If you apply the changes below to the linear parent function .f(x)=x what is the equation of the new function ? vertically stretch by a factor of 3 ; flip over the x axis

The measures of ? 1, ? 2, and ? 3 are 40%, 12.5%, and 25% of the sum of the angle measures of the quadrilateral. find the value of x.