10 = x -1 answer this question, the x is the unknown number

Which of the binomials below is a factor of this trinominal? x^2-13+30

Find the exact value of each of the following. in each case, show your work and explain the steps you take to find the value. (a) sin 17π/6 (b) tan 13π/4 (c) sec 11π/3

Acircle has a circumference of 28.36 units what is the diameter of the circle