Please help me on my math

What is the compound interest in a three-year, $100,000 loan at a 10 percent annual interest rate a) 10.00 b) 21.00 c) 33.10 d) 46.41

Which number produces a rationale number when multiplied by 1/5

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}