Use a half-angle identity to find the exact value of sin 3pi/8

What is the prime factorization of 23 ?me with this question

For the quadratic function [tex]y=(x+4)^2-1[/tex] , do the following: a) rewrite the function in the standard form, b) rewrite the function in intercept form, c) find the vertex, d) find the y-intercept, e) find the x-intercepts.

Can you divide 25 into 4 equal groups? explain why or why not.