Consider the following method. An 11-line code segment reads as follows. Line 1: public static boolean mystery, open parenthesis, String str, close parenthesis.
Line 2: open brace.
Line 3: String temp equals, open double quote, close double quote, semicolon.
Line 4: blank.
Line 5: for, open parenthesis, int k equals str, dot, length, open parenthesis, close parenthesis, semicolon, k greater than 0, semicolon, k minus, minus, close parenthesis.
Line 6: open brace.
Line 7: temp equals temp plus str, dot, substring, open parenthesis, k minus 1 comma k, close parenthesis, semicolon.
Line 8: close brace.
Line 9: blank.
Line 10: return temp, dot, equals, open parenthesis, str, close parenthesis, semicolon.
Line 11: close brace.

Required:
What calls to mystery will return true?

5.a fishing rod is formed from a composite material of 0.5 kg of glass fibers embedded in a matrix of 0.5 kg of epoxy resin. the glass fibers are assumed to be long, continuous and unidirectional. to achieve a greater stiffness it is proposed to use a different composite that is comprised of long continuous carbon fibers that will be embedded in a matrix of 0.5 kg of epoxy resin. if the modulus of elasticity of the carbon fiber composite is 10% greater than the elastic modulus of the glass fiber composite, estimate the mass of carbon fibers that will be used to make the carbon fiber composite. assume the applied tensile stress is parallel to the direction of the long axis of the fibers. the epoxy resin, glass fiber, and carbon fiber have an elastic modulus of 5, 86, and 350 gpa respectively and a density of 1100, 2500, and 1800 respectively.