The point (1, −1) is on the terminal side of angle Θ, in standard position. What are the values of sine, cosine, and tangent of Θ?

What is the base of 1/9 to the power of 2

How can you construct perpendicular lines and prove theorems about perpendicular lines

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.