What is the percent of increase for a population that changed from 438,000 to 562,000

The train station clock runs too fast and gains 5 minutes every 10 days. how many minutes and seconds will it have gained at the end of 9 days?

Write an algebraic expression to match each statement a. four less than 8 times a number b. twice the difference of a number and six c. nine from a number squared

Me. i can't figure out this question. give an explanation too. .