Find the diameter and radius of a circle that has a circumference of a 23 cm

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

`if you have a set of parallel lines a and b cut by transversal x, if angle 1 = 167 degrees, what is angle 4 and why. also what is the measure of angle 5 and why? you need to use the names of the angle relationship and explain. ''.

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a.p.