My classmate sent me this, apparently it's some sorta puzzle. Does anyone know the answer?

1 = 1
13 = 10
66 = 48
100 = ?

Can (3,5 and square root 34) be sides on a right triangle?

What situation is an example of an observational study

Find the x-intercepts of the parabola withvertex (1,1) and y-intercept (0,-3).write your answer in this form: (x1,if necessary, round to the nearest hundredth.