Twice the sum of 4 and a number is 34. what is the number?

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Apackage of orgainc strwberries costs $1.50 while there in season and $2.25 when not in season what the percent increase

Atown has a population of 17000 and grows at 2.5% every year. to the nearest year, how long will it be until the population will reach 19600?