Evaluate 2* for (a) x = -2 and (b) x= 3. Write your answers in simplest form.

a. The expression is

when x = -2.

b. The expression is

when x =3.

In triangle abc, the length of side ab is 12 cm, the length of side bc is 5 cm, and the length of side ca is 9 cm. find the measure of angle a using the law of cosines.

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.

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.