a) How would I convert decimals to percent?

b) How would I convert % to a decimal?

c) How would I convert feet to meters and meters to feet AND miles to km and km to miles?

"percent" means "per hundred" hundredths.

a)Move the decimal point two places to the right (0.505 to 50.5%)

b)Move the decimal point two places to the left (22.8 % to 0.228)

c) Depends on what resources you're allowed:

Use a favelet or bookmarklet in a web browser. These are bits of JavaScript that are used in place of a URL in the browser's favorites or bookmarks. Search using Google or Ask.com or visit Bookmarklets - Calculator and Converter tools (you may end up converting to yards between meters and feet). Note that despite the similar names, Java and JavaScript are significantly different technologies.

Determine the conversion factor through research then use multiplication (calculator or even pencil and paper)

Or

Use a printed conversion chart. A search engine can locate those, some of which can be printed out for offline use. There may be some available for photocopying (legal fair use if you only copy a few pages for yourself) in books located in your school or public library's research section.

Thanks for your help. Also,

1) How would I find the perimeter of an angle using the Pythagorean theorem?

2) How would I find the 3rd right triangle of an angle using the Pythagorean theorem?

3) How would I find the area of a shaded object?

1) The Pythagorean Theorem doesn't utilize or generate angles, only lengths of the two sides and hypotenuse of a right triangle (one angle is 90°). I'm not familiar with an "angle" having a perimeter. Are you wanting to calculate the hypotenuse or the total of the triangle's two sides and hypotenuse?

2) See above. The inside angles of a triangle always total 180°, so calculating the third angle when two are known is a simple matter of subtraction.

3) Would vary depending on the shape. There's a formula for the area of a circle. The area of a parallelogram is the product of the width and height (includes rectangles and squares). Triangles are half of a parallelogram. Many other polygrams can be divided up into triangles. There may be methods I haven't listed and may not be familiar with.