Pls ill give brainelist

138

Step-by-step explanation: If you subtract 430 by 170, you get 260. Then, when you add 260+284, you get 544. Then when you subtract 852 by 544, you get 308. Finally, subtracting 308 by 170 gets you to your final answer, 138. Hope that helps, have a great day :)

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.