Sheila has 5 times as many markers as dave. together, they have 18 markers. how many markers does sheila have? plz explain question and why that is

If a 36 inch yardstick casts a 21 foot shadow, how tall is a building whose shadow is 168 feet? what is the scale factor

Ian is in training for a national hot dog eating contest on the 4th of july. on his first day of training, he eats 4 hot dogs. each day, he plans to eat 110% of the number of hot dogs he ate the previous day. write an explicit formula that could be used to find the number of hot dogs ian will eat on any particular day.

What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83