16 = x2 - 10x + 25. this is chapter 2 of algebra 2 and its in the perfect square trinomial subject. the 2 after the first x is supposed to be squared

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.

the answer is c: divide the arc's degree measure by 360°, then multiply by the circumference of the circle.