An author is paid $500 as an advance on their book plus an additional $4 for every book sold. if the author earns $880, how many books has he or she sold?

Asurvey of 45 teens found that they spent an average of 25.6 hours per week in front of a screen (television, computer, tablet, phone, based on the survey’s sample mean, which value could be the population mean? 2.3 hours 27.4 hours 75.3 hours 41.5 hours

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

Write the expression as a single natural logarithm. 2 in a - 4 in y