Plot the following
a. (x + 1)² + (y - 3)² = 25
b. (x - 1)² = 8y - 8

7x+8y=-18, 4x-9y=-3 solve the system of equations

Suppose that in 2008 , 840,800 citizens died of a certain disease assuming the population of teh country is 399 miliion, what is the mortality rate in units of deaths per 100,000 people?

Describe how to determine the average rate of change between x = 4 and x = 6 for the function f(x) = 2x^3 + 4. include the average rate of change in your answer.