the radius and height of a cylinder are in the ratio 7:2. if the volume of the cylinder is 8316cm, find the total surface area of the cylinder​

What is the value of x when x + 7 = 21?

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.

Iknow its nothing to do with education, but what type of thing should i wrote here? ? : ) its for mcdonald's btw.