What is 13 / 143 as a unit fraction

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

Plz ( true - false) all triangles have interior angles whose measure sum to 90.

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)