android app math chart create graph write

im looking for someone to write and android app for me. im looking for a a program to help me with a seive test, for testing material. currently i do it all on paper with a calculator and pen and paper. ideally it will do the math eqautions for me and then graph them when its all done through set parameters. ive never really looked for an app writer before so i dont know what to put here besides if you think you can do this contact me. i have no idea how much this is worth so i wont be putting a price down. but i do expect to pay for the app. i can also say i know sevral others that would pay for this also. thanks when i choose you i will be providing some examples of what im looking for. ryan