Perpendicular number lines which interstate to divide a coordinate plane into four regions are called

Aconvex octagon has interior angles that measures 73 degrees, 172 degrees, 132 degrees, 59 degrees, 154 degrees, 163 degrees, x degrees, 2x degrees find the value of the missing angles

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

Write a fraction less than 1, which has a denominator of 6 and is greater than 3/4 plz answer !