Simplify the expression to a + bi form:
(12 - i) - (8 - 8i)

Evaluate 4 a for a = 5 2/3 . express your answer in simplest form.

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?