The radius of a circle is 5 centimeters. What is the area of a sector bounded by a 90° arc?
900
r=5 cm
Give the exact answer in simplest form.
square centimeters

In 1995 america online had about 3000000 users over the next decade users are expected to increase from a few million to the tens of millions suppose the number of users increased by 150% by the year 2000 how many users will there be in the year 2000