Rearrange the formula c^2=a^2+b^2 for b

Which of the following are accepted without proof in a logical system? check all that apply.

The input to the function is x and the output is y. write the function such that x can be a vector (use element-by-element operations). a) use the function to calculate y(-1.5) and y(5). b) use the function to make a plot of the function y(x) for -2 ≤ x ≤ 6.

Need solving this 2nd limit problem.