PLSSS PEOPLE I NEED HELP

What is the smallest integer n such that n\sqrt{2} is greater than 20

16. you're planning to buy a boat, a motor, and some miscellaneous boating equipment. the boat costs $325, the motor costs $225, and the equipment costs $79. if you've saved $438 toward these purchases, how much more do you need to save? a. $181 b. $281 c. $291 d. $191

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!