19. Suppose the total cost in dollars to produce x widgets is given by the function C(x)=0.0002x^3+0.09x^2+12x+1500 A. Find the average rate of change of the total cost when the number of widgets produced increases from 100 to 300 items. B. Find the average rate of change of the total cost when the number of widgets produced increases from 200 to 500 items.

Simplify the Rational Expression $\frac {x^{2}-9}{x^{2}+x-6}$

7. A fair six-sided die is rolled. What are the odds of getting a 3 or higher. Leave your answer as a reduced fraction. $\square $

Find $(2(cos\frac {2\pi }{3}+isin\frac {2\pi }{3}))^{5}$ $-16-16i\sqrt {3}$ $16+16i\sqrt {3}$ $16\sqrt {3}+16i$ $-16\sqrt {3}-16i$

Convert into a complex number: $2(cos\frac {4\pi }{3}+isin\frac {4\pi }{3})$ $-\sqrt {3}-i$ $\sqrt {3}-i$ $-1-i\sqrt {3}$ $1+i\sqrt {3}$

Convert into a polar coordinate: $2\sqrt {3}-2i$ $(4,\frac {7\pi }{6})$ $(-4,\frac {11\pi }{6})$ $(-4,\frac {5\pi }{6})$ $(4,\frac {\pi }{6})$

10. Simplify the expression. $\sqrt {125t^{4}r^{3}s^{13}}$

1. What is the simplified form of $-\sqrt {(y+5)^{16}}$ A. $(y+5)^{8}$ B. $-(y+5)^{8}$ C. $(y+5)^{4}$ D. $-(y+5)^{4}$

Which quadrilateral does not have diagonals that are perpendicular? Rectangle Rhombus Square

Simplify the following expression completely. $\frac {x^{2}-14x+45}{x^{2}-18x+81}$

What is the measure of an exterior angle in a regular 15-gon? Write your answer as an integer or as a decimal rounded to the nearest tenth.