AB=2 BC=3 AC=4 circumscribed circle​

One side of a rectangle is 7 centimeters shorter than six times the other side. find the length of the longer side if we also know that the perimeter of the rectangle is 266 centimeters.

Cate purchases $1600 worth of stock and her broker estimates it will increase in value by 4.2% each year. after about how many years will the value of cate's stock be about $2000

Since we have computer algebra systems that can solve polynomial division problems for us, why is it necessary to learn how to do these things by hand?