Simplify sin(0)csc(0)-sin2(0)

2.30+0.4-0.88+1.33 can u explain the answer to this why the answer is 3.15

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.

The table showed price paid per concert ticket on a popular online auction site. what was the average price paid per ticket