If 5 times a number is equal to the sum of twice the number and 15. What is the number?

Which of the following transformations will always produce a congruent figure?

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?

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.