Final answer:
To find the measure of angle 5, you just need to look at the expression given in the question, which is 'm∠5 = (9x - 43) degrees', corresponding to option B.
Step-by-step explanation:
The question provides two expressions for the measures of angles 4 and 5, namely m∠4 = (3x + 7) degrees, and m∠5 = (9x - 43) degrees. To find the measure of angle 5, we need to identify the correct expression among the choices given. The expression 'm∠5 = (9x - 43) degrees' is already provided in the question and matches option B, which means option B is the correct answer.