Membership in a skiing club is expected to grow by about 8% per month. currently, there are 530 members. in about how many months will membership reach 850 members?

a-14months
b-11months
c-9months
d-6months

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

Afamily went out to dinner and their bill was $113.if they want to leave a 19% tip, how much should they leave.

Math i have no idea how to do a and b