Answer:
see below
Step-by-step explanation:
12. sqrt(15^2+12^2)=3sqrt(41) or around 19
13. 45 45 90 triangle means the hypotenuse is sqrt(2) times bigger, so it's 90sqrt(2) or around 127
14. 8 and 6 - divide by 2
4 and 3 - use pythagorean triple 3 4 5
multiply 5 and 2 to get to the hypotenuse being 10
subtract the original amount
8+6-10=4
15. sqrt(200+125^2)=25sqrt(89) or around 236
