What are three numbers greater than 20 that have 9 as a factor

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

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.

If the tip varies directly with the number of guest which equation represents between the tip,t, and the number of guest,g?