Uli wants to write the phrase “the difference of seven and a number squared” as an algebraic expression. She wrote out several expressions in the table. Which expression correctly represents the phrase? Expression Number
Expression
1
StartFraction 7 Over 2 n EndFraction
2
n squared minus 7
3
7 minus n squared
4
StartFraction 2 n Over 7 EndFraction

Expression number

The annual snowfall in a town has a mean of 38 inches and a standard deviation of 10 inches. last year there were 63 inches of snow. find the number of standard deviations from the mean that is, rounded to two decimal places. 0.44 standard deviations below the mean 2.50 standard deviations below the mean 0.44 standard deviations above the mean 2.50 standard deviations above the mean