4. a rectangular field has a perimeter of 300m. what is the area of the field if the length of the field is twice the width of the field? ® 5000 m² 300 m 5000 m 600 m2

How to do this , and can some one explain

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

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.