Find the circumference of the circle to the nearest hundredth. Use 3.14 for π. Radius 21 cm.

What is the slope of the line shown below?

Precalculus question, image attached.

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.