what is the radius of a circle whose equation is (x + 5)2 + (y – 3)2 = 42?
2 units
4 units
8 units
16 units

We are tasked to solve for the radius in the given expression below:
 (x + 5)² + (y – 3)² = 4²

We know that the standard form of a circle equation is:
(x-h)² + (y-k)² = r²

We need to transform the given expression into its standard form such as:
(x + 5)² + (y-3)² =4²

Therefore, the radius is 4 units which letter "B" in the choices.