Mark and joe shared a bag of carrots. if mark ate 0.34 of the bag and joe ate 0.56 of the bag who ate more carrots

Which matrix multiplication is possible?

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

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.