19) * 4 points
If the measure of an interior angle of a regular polygon is 160°,
then the polygon has sides.
A) 9
B) 12
C) 18
D) 20

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

Aperpendicular bisector, cd is drawn through point con ab if the coordinates of point a are (-3, 2) and the coordinates of point b are (7,6), the x-intercept of cd is point lies on cd.

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?