The total area of alaska is 656,000 square miles. of that, 570,000 square miles is land area. about what percent of alaska is not land area? show work

1foot = 12 inches; 1 yard = 3 feet

The radius of the circle is 4 cm and the measure of the central angle is 90° the area of the sector with a central angle measuring 90° and radius of length 4 cm is vt cm the triangle in the sector is 4 cm the area of the triangle is v/cm² the area of the segment of the circle is (471 - ) cm?

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a