Half of circle is called a semicircle. a cemicircle has a diameter of 30 inces. what is the area of the window to the nearest square inch

Pls! does anybody know a shortcut for answering these types of questions in the future?

Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.

3questions show how you solved the problem 1. subtract & simplify (–y2 – 4y – 8) – (–4y2 – 6y + 3) 2.multiply and simplify 2x2y3z2 · 4xy4x2 3.multiply and simplify (x – 4) (x2 – 5x – 6)