Convert the cartesian coordinates below to polar coordinates. give an angle θθ in the range 0< θ≤2π0< θ≤2π, and take r> 0r> 0.
a. (0,−5)=(0,−5)= ( 5 , )
b. (72,73√2)=(72,732)= ( 40.25 , 1.047 )

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b

The given diagram shows the parts of a right triangle with an altitude to the hypotenuse. using the two given  measures, find the other four.

Add, subtract, multiply, or divide as indicated. list any restrictions for the variable(s) and simplify the answers when possible. 1) x-2 / x+5 + 3x / 2x-1 2) x+6 / x-6 - x^2 / x+6 3) x+9 / x-4 + x+2 / x^2-11x+28 4) x / x^2-64 + 11 / 2x^2+11x-40 5) 5 / x + 11 / x-3 - x-4 / x^2+2x-15