Give examples of 100% increase 100% decrease and 100% error . explain each

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

How would you find the height of points on the circle? the topic is trigonometry.