15) If a rectangle has a length of 16 centimeters and a width of 20 centimeters, what is the area?
A)
36 cm
B
72 cm
320 cm
D
640 cm?
E)
102,400 cm?

Louise measured the perimeter of her rectangular scrapbook to be 154 cm. if the scrapbook is 45 cm wide, how long is the scrapbook?

Anew shopping mall is gaining in popularity. every day since it opened, the number of shoppers is 5% more than the number of shoppers the day before. the total number of shoppers over the first 10 days is 1258 how many shoppers were on the first day?

Math i have no idea how to do a and b