Can someone help I need the answers

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

Caitlin had 402. in her bank account. she withdrew $15.each week to pay for swimming lesson. she now has $237.

Ms. aniston asked seven students in her class to collect pet food cans for a local animal shelter. the dot plot shows the number of food cans collected by each student. each dot represents one student. what is the median of the data set? a. 6 b. 9 c. 7 d. 8