Since a^2 + b^2 = c^2, for the first one, you can do (8)^2 + (5)^2 = c^2 to find the hypotenuse. Which will be c^2 = 89, which you then have to put in a radical, which gives 9.42! For the next one, since you have C and A, you’ll have to find B. So the equation will be (12)^2 + b2 = (17)^2. Which is then 144 + b2 = 289. So subtract 289-144, it’ll be 145 = b2, then put it in a radical and ends up being b= 12.04!