Nic Westlake

Welcome to version 0.9a of RK-89. RK-89 is the latest release in the most advanced graphing calculator suite available on the App Store. RK-89 introdu …

Visit www.rkalk.com to see video tutorials on powerful RK-83 features!Don't spend $100+ on an old fashioned graphing calculator. Get all these feature …

...for when you just need to know. Don't spend another second wondering if that number is prime. Check it! Primes Lite will give you a lightning quick …

...for when you just need to know. Don't spend another second wondering if that number is prime. Check it! Primes will give you a lightning quick verd …